Two years ago this was a simple comparison. The TAG Heuer Formula 1 was the cheap quartz option and the Longines HydroConquest was the serious automatic diver. That gap has mostly closed.
TAG Heuer relaunched the Formula 1 in 2025 with a solar movement and a $1,750 starting price. Longines rebuilt the HydroConquest from the ground up in March 2026. Two full redesigns inside a year.
So the old advice no longer works. This guide covers what changed on each side, what each watch costs now, and which one suits which buyer. Read it before you shop, because the first decision is not the brand. It’s the generation.
TAG Heuer Formula 1: History and the 2025 Relaunch
TAG Heuer launched the Formula 1 in 1986, right after the TAG takeover of Heuer. It was the first watch to carry the TAG Heuer name. Early versions used colorful fiberglass cases and battery quartz movements to keep them light and affordable.
The brand aimed it at buyers who wanted a Swiss sports watch with a racing link and easy daily use. That role never really changed. What changed is the price tier, and the full Formula 1 lineup is broken down in more depth than this comparison can manage.
In January 2025, Formula One confirmed TAG Heuer as the series’ official timekeeper, ending Rolex’s run in the role after a ten-year deal was agreed with LVMH. TAG Heuer followed at Watches and Wonders 2025 with a full Formula 1 relaunch.
The new line is the Formula 1 Solargraph. It keeps the 1986 look but drops the battery for a light-powered movement, and it sits at 38mm instead of the old 35mm. Retail opened at $1,750 on rubber and $1,850 on the steel bracelet.
Collector interest still runs strongest on the early references. Those first fiberglass models looked nothing like the rest of Swiss sport watchmaking in the late eighties, and that oddness is exactly why people still hunt them. The bold bezel colors and the Mercedes hour hand carry through the whole line.
Notable TAG Heuer Formula 1 references:
- TAG Heuer Formula 1 Solargraph Ref. WBY1111.BA0042
- TAG Heuer Formula 1 Ref. CAZ1010
- TAG Heuer Formula 1 Ref. WA1211
- TAG Heuer Formula 1 Ref. 380.513
Longines HydroConquest: History and the 2026 Redesign
Longines launched the HydroConquest in 2007 as the dive watch inside the Conquest family. It was not a revival of an older design. Longines built it around modern diving specs from day one.
The target buyer is someone who wants a Swiss automatic diver for everyday wear. Real water resistance, a clean dial, a sporty case, but not so tool-like that it fights a shirt cuff. That balance is why it became one of the brand’s best sellers.
The line moved in steps. A 2018 refresh brought ceramic bezel inserts and new colors. The HydroConquest GMT arrived in 2023 with a different case shape. Then in March 2026, ahead of Watches and Wonders, Longines gave the whole collection its biggest overhaul since 2007 and pulled the GMT’s design language across the rest of the range.
Enthusiasts tend to pick the HydroConquest for practical reasons rather than romantic ones. It wears well, the specs hold up against watches costing more, and the updates have been sensible rather than showy. Our Longines HydroConquest buying guide goes model by model if you have already ruled out the TAG.
Notable Longines HydroConquest references:
- Longines HydroConquest Ref. L3.779.4.96.6
- Longines HydroConquest Ref. L3.788.4.96.6
- Longines HydroConquest Ref. L3.781.4.56.6
- Longines HydroConquest GMT Ref. L3.790.4.96.6
TAG Heuer Formula 1 vs Longines HydroConquest: Most Notable Differences
These two get cross-shopped because they land in the same price bracket and both wear as everyday Swiss sports watches. Six differences decide it, and each heading below names the winner.
1. Movement
The current Formula 1 runs the Calibre TH50-00 Solargraph, a solar quartz movement. A minute in direct light powers it for a day. A full charge takes under 40 hours of light and gives up to ten months of running in total darkness. The accumulator is rated to last around fifteen years.
The HydroConquest uses the automatic Calibre L888.5, built on an ETA 2892A2 base, a movement architecture the Swatch Group has refined since the 1970s. It beats at 25,200vph, or seven ticks per second, and holds 72 hours of reserve.
Its silicon balance spring is rated to ten times the ISO 764 standard, which is the industry benchmark for how much magnetism a watch can shrug off before it starts running fast.
Solar means you never set it, never wind it, never think about it. Automatic means a rotor you can feel and a movement that needs wearing. The Formula 1 suits people who own several watches and want one that survives a drawer. The HydroConquest suits people who want a mechanical watch first, though keeping an automatic running off the wrist takes a little planning.
2. Water Resistance
The Formula 1 Solargraph is rated to 100 meters. That covers swimming and showering. Older Formula 1 references like the WA1211 and CAZ1010 were rated to 200 meters, so the current generation stepped down here.
The HydroConquest holds 300 meters, with a screw-in crown and a screw-down case back. Both ends of the case are sealed, not only the crown.
There’s a second difference most spec sheets bury. The Formula 1 bezel turns in both directions. The HydroConquest bezel turns one way only, which is what a real dive bezel has to do so an accidental knock can never make your remaining air look longer than it is. If you have never used one, how it is meant to be read takes about two minutes to learn.
Anyone who swims, dives or works around water should take the Longines. The Formula 1 is a sports watch that handles water, not a dive watch. If you want a TAG that dives, the Aquaracer lineup is the one to look at.
3. Case Size
The Formula 1 Solargraph sits at 38mm and 9.9mm thick. That is a deliberate middle ground, and it lands well on wrists between 6 and 7.5 inches. The older quartz references ran 35mm and the chronographs ran 43mm, so the line has covered a wide spread over the years.
The 2026 HydroConquest comes in two sizes, both 11.7mm thick. The 39mm has a 48.1mm lug-to-lug and suits wrists from about 6.5 to 7 inches. The 42mm runs 51.2mm lug-to-lug and handles 7 to 8 inches comfortably.
That thickness figure matters more than the diameter. The previous generation measured 11.9mm in the 41mm case, and the discontinued 43mm sat high enough to catch on a jacket sleeve. If you are unsure where you land, how to work out your size is worth two minutes before you order.
Smaller wrists have two good options now. Larger wrists are better served by the 42mm Longines, because the Formula 1 only comes one way.
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4. Bezel Material
The HydroConquest uses a ceramic bezel insert. Ceramic shrugs off the scuffs that steel and aluminum pick up, so it still looks clean after a few years of desk edges and door frames.
The Formula 1 Solargraph uses TH-Polylight, TAG Heuer’s bio-polyamide. It appears on the bezel across every model, and on the middle case of the cheaper versions. Steel-cased models get a DLC treatment.
Here’s the honest part. TH-Polylight is a nod to the 1986 original and it keeps the watch light, but it is still a plastic bezel on a watch that starts at $1,750. Some buyers love the reference. Others walk away when they handle it. Try one before you commit.
If long-term appearance matters more than heritage, ceramic wins. If the 1986 look is the whole point, the polyamide is the point too.
5. Bracelet and Clasp
The 2026 HydroConquest is where Longines put most of its work. Buyers choose between an H-link steel bracelet and a Milanese mesh, and both use a folding clasp with four positions of on-the-fly micro-adjustment. Lug width is 20mm on the 39mm and 21mm on the 42mm.
The Formula 1 Solargraph comes on a sandblasted three-row steel bracelet or a matching rubber strap, depending on the model. There is no micro-adjust system on either.
Micro-adjustment sounds like a small thing until summer. Wrists swell in heat, and a bracelet sized in a cool room can feel tight by mid-afternoon. Four clicks of slack solve that in three seconds without taking links out yourself.
Worth knowing before you shop the older Longines: owners on Watchuseek consistently name the previous-generation bracelet the watch’s weakest point, because the polished center links pick up swirls fast and there is no micro-adjust at all. Daily bracelet wearers should take the new Longines. The Formula 1 is the better pick if you plan to live on the rubber strap anyway.
6. Running Cost
Solar quartz is close to free to own. No winding, no service interval, no accuracy drift to chase. The accumulator eventually needs replacing, but on a fifteen-year rating that is a problem for a future owner. We cover whether quartz needs servicing at all separately.
Longines publishes a service interval of six to eight years for its mechanical watches, though most dive-watch owners land closer to five to seven because gaskets harden faster than movements wear.
Budget roughly $400 to $600 for a full service at Longines, or $250 to $400 through a qualified independent. See what a full service really costs for how those numbers move by brand.
The Formula 1 is cheaper to keep. The HydroConquest costs more over ten years, and mechanical owners generally accept that as part of the deal.
Choosing Between the Old and New Generations
Both lines now have two generations sitting in dealer cases and marketplace listings at the same time. Most comparisons skip this, and it is the decision that saves or costs you the most money.
Formula 1
The Solargraph is the better everyday watch. It is more legible, better finished, and the solar movement removes the one annoying thing about old quartz, which is a dead battery on a Sunday morning.
The older references are the better buy if you want the eighties character and don’t mind battery changes. A clean 380.513 or WA1211 costs a fraction of a new Solargraph and carries the design that made the line famous.
Check the bezel and crystal carefully, since replacement parts for the early composite models are getting scarce. If you are weighing the Formula 1 against TAG’s dressier chronograph line instead, our Carrera versus Formula 1 comparison covers where the extra money goes.
HydroConquest
The 2026 watch is better on paper and better on the wrist. Thinner case, cleaner dial with applied indexes instead of the old oversized Arabic numerals, and the micro-adjust clasp.
The previous generation is the value play, and it is a real one. Those 41mm and 43mm automatics are trading well below their old retail as dealers clear stock. The 0.2mm of extra thickness is not the reason to skip them. The bracelet is.
One caution. The 32mm, 44mm and two-tone PVD models are discontinued. If you want one of those, buy it while stock lasts, because it is not coming back.
Price and Market Demand
Pricing on these two lines behaves differently, and the reason is straightforward. One is a mechanical watch with steady demand and one is a quartz watch with a famous name attached.
Start at the entry point. WatchCharts puts the average TAG Heuer Formula 1 at around $1,000, with the full range running from roughly $200 to $4,000 across 242 in-production and discontinued models. That $200 floor is the older battery quartz end, and it is genuinely cheap territory for a Swiss watch.
The HydroConquest averages closer to $2,000 on the same platform. Nothing in the line trades in the low hundreds. The floor is higher because the automatic movement is the floor.
Now the top end, where retail versus market gets interesting. The Formula 1 Solargraph launched at $1,750 on rubber and $1,850 on the steel bracelet. The 2026 pastel additions retail at $1,950, and the diamond-set steel pair at $2,800.
On Chrono24, Solargraph listings sit broadly between $1,350 and $2,350. Most of the collection trades at or below retail.
The 2026 HydroConquest retails at $2,200 on the H-link bracelet and $2,400 on the Milanese mesh. Secondary listings for the new generation cluster around $2,100 to $2,400. That is a much tighter band, and tight bands mean the market agrees on what the watch is worth.
Read the gap this way. A watch trading close to retail on the secondary market has real demand supporting it. A watch trading well under retail is one where the retail number was aspirational. The HydroConquest holds. The Solargraph gives back roughly 15 to 25 percent the moment it leaves the store.
There is a third route worth knowing. Grey-market sellers move the new-generation HydroConquest at 15 to 25 percent below retail, which puts a 39mm at roughly $1,650 to $1,870 with a dealer warranty instead of the full Longines one. The AD versus grey-market trade-off covers what that costs you at resale.
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The previous-generation HydroConquest tells the other half of the story. Those 41mm automatics list around $1,400 to $1,700 in clean condition. That is a discontinued Swiss automatic diver with 300m and a ceramic bezel for less than a new solar quartz Formula 1.
On liquidity, the Longines moves faster. Dive watches with automatic movements have a wide buyer pool, and the HydroConquest sits in the same shopping cart as the Tudor Black Bay and the Oris Aquis. If the Tudor is the real rival on your list, we cover the Black Bay lineup separately.
The Formula 1 sells fastest in the limited editions tied to specific races, where the buyer is a motorsport fan rather than a watch collector.
What moves the number on either watch: full set with box and papers, bracelet condition, bezel scratches, and the year on the warranty card. Our notes on how dealers grade condition explain what they weigh. On the Longines specifically, the generation is now the biggest single price variable in the line.
Notable TAG Heuer Formula 1 References
These four references map the line from the 1986 original through to the current solar generation. Each one represents a different idea of what a Formula 1 was supposed to be.
1. TAG Heuer Formula 1 Solargraph Ref. WBY1111.BA0042
The headline spec is the Calibre TH50-00, a solar quartz movement that charges from daylight and office light alike. That single change fixes the biggest complaint about the old line, which was the battery. This is the reference that anchors the whole 2025 relaunch, in the plainest colorway TAG Heuer offers.
On the wrist it reads as a smaller, sharper version of the eighties watch. The white opaline dial sits inside a red flange, the black bezel frames it tightly, and the 38mm case keeps the whole thing modest. What surprises most people who handle it is the bezel action, which is crisp despite being polyamide rather than metal.
- Movement: Calibre TH50-00 Solargraph, solar quartz
- Case Diameter: 38 mm
- Case Thickness: 9.9 mm
- Case Material: Stainless steel with DLC treatment
- Bezel: Black TH-Polylight, bidirectional
- Crystal: Sapphire with anti-reflective coating
- Water Resistance: 100 meters
- Dial: White opaline with applied indexes and Super-LumiNova
- Bracelet: Sandblasted steel three-row
- Price Range: $1,400 to $1,900
2. TAG Heuer Formula 1 Ref. CAZ1010
The defining feature here is the quartz chronograph layout. It turned the Formula 1 from a simple three-hander into a proper racing watch with subdials, and it pushed the case to 43mm. This is the reference most people picture when they think of a modern TAG Heuer Formula 1.
The fixed tachymeter bezel does a lot of the visual work. It fills the dial edge with numbers and gives the watch a busy, purposeful face that reads instantly as motorsport. Wrist presence is the trade-off. At 43mm this is a large watch, and it looks it.
- Movement: Quartz chronograph
- Case Diameter: 43 mm
- Case Material: Fine-brushed stainless steel
- Bezel: Fixed steel with black tachymeter scale
- Crystal: Sapphire
- Water Resistance: 200 meters
- Functions: Hours, minutes, seconds, chronograph, date
- Bracelet: Steel with folding clasp and push buttons
- Price Range: $700 to $1,400
3. TAG Heuer Formula 1 Ref. WA1211
The key detail is the stainless steel case, which is what made this the bridge reference in the line. It kept the Formula 1 shape and bezel but wrapped them in a conventional material, and that brought in buyers who found the first generation too loud.
Wear it today and it feels like a genuinely small watch. At 35mm it sits inside the wrist rather than on top of it, which reads as vintage now but was simply normal in the early nineties. The plastic rotating bezel remains the weak point to inspect on any example.
- Movement: Quartz
- Case Diameter: 35 mm
- Case Material: Stainless steel
- Bezel: Plastic rotating
- Crystal: Mineral glass
- Water Resistance: 200 meters
- Dial: Time and date with luminous hands and markers
- Bracelet: Stainless steel
- Price Range: $430 to $980
4. TAG Heuer Formula 1 Ref. 380.513
The defining feature is the fiberglass composite case. It made the watch light, cheap to produce, and completely unlike the steel sports watches sitting next to it in 1986 shop windows. That is the whole reason this reference still matters.
Handle one and the weight is the first thing you notice, or rather the lack of it. It feels closer to a Swatch than to a Swiss sports watch, which was the point. Condition drives everything on these, because composite cases crack and the parts supply has thinned out.
- Movement: Quartz
- Case Diameter: 35 mm
- Case Thickness: Around 9 mm
- Case Material: Fiberglass composite
- Bezel: Plastic dive-style
- Crystal: Mineral glass
- Water Resistance: 200 meters
- Strap: Rubber
- Price Range: $320 to $590
Notable Longines HydroConquest References
These four cover the current generation, the outgoing one, and the GMT that set the design direction for everything Longines did in 2026.
1. Longines HydroConquest Ref. L3.779.4.96.6
The headline number is 11.7mm of thickness in a 39mm case with 300 meters of water resistance. That combination is hard to find, and it is the single biggest reason the 2026 redesign landed as well as it did.
The dial change matters just as much. Longines dropped the oversized Arabic numerals at 6, 9 and 12 for applied geometric indexes, and the watch immediately reads more grown-up. At a glance it now looks like a watch you could wear to a meeting, which the old one never quite managed. The 48.1mm lug-to-lug is the number to check against your own wrist.
- Movement: Calibre L888.5, automatic, ETA 2892A2 base
- Power Reserve: 72 hours
- Case Diameter: 39 mm
- Case Thickness: 11.7 mm
- Water Resistance: 300 meters
- Bezel: Blue ceramic, unidirectional
- Dial: Blue lacquered with applied indexes and Super-LumiNova
- Lug Width: 20 mm
- Bracelet: H-link steel with four-position micro-adjust clasp
- Price Range: $2,000 to $2,300
2. Longines HydroConquest Ref. L3.788.4.96.6
Same watch, 42mm case. The specs carry across identically, which is unusual and welcome, because size-based spec downgrades are common at this price point.
The difference you feel is the 51.2mm lug-to-lug. This version has genuine wrist presence and suits anyone over about 7.25 inches. Lug width steps up to 21mm here, which is worth knowing before you start buying straps, since 21mm options are thinner on the ground than 20mm.
- Movement: Calibre L888.5, automatic
- Case Diameter: 42 mm
- Case Thickness: 11.7 mm
- Lug-to-Lug: 51.2 mm
- Water Resistance: 300 meters
- Bezel: Blue ceramic, unidirectional
- Lug Width: 21 mm
- Bracelet: H-link steel or Milanese mesh
- Price Range: $2,000 to $2,400
3. Longines HydroConquest Ref. L3.781.4.56.6
This is the 41mm previous-generation model, and it is the smart-money pick on the used market right now. Black dial, black ceramic bezel, same 300m rating, and the L888 caliber from the same family as the current one.
What you give up is the thinner case and the micro-adjust clasp. What you get back is a few hundred dollars. The oversized numerals date it slightly against the 2026 watch, though plenty of buyers prefer that dial and always did. Full sets with box and papers move quickly at the moment.
- Movement: Calibre L888, automatic
- Case Diameter: 41 mm
- Case Thickness: 11.9 mm
- Water Resistance: 300 meters
- Bezel: Black ceramic, unidirectional
- Dial: Black with date and oversized numerals
- Lug Width: 21 mm
- Bracelet: Steel with folding clasp, no micro-adjust
- Price Range: $1,400 to $1,700
4. Longines HydroConquest GMT Ref. L3.790.4.96.6
The feature is a true traveler GMT running the Calibre L844.5, with a local hour hand that sets independently through the crown. You jump time zones without stopping the movement, and plenty of watches at twice the price don’t offer it. We explain how the jumping hour works in practice if the complication is new to you.
This reference also mattered strategically. Its case and dial language, launched in 2023, is what Longines rolled out across the entire HydroConquest range three years later. Wear one next to a 2026 three-hander and the family resemblance is obvious.
- Movement: Calibre L844.5, automatic GMT
- Case Diameter: 41 mm
- Water Resistance: 300 meters
- Bezel: Blue ceramic, unidirectional
- Crystal: Sapphire with anti-reflective coating on both sides
- Dial: Sunray blue with GMT hand and date
- Bracelet: H-link steel with 5 mm of micro-adjust
- Retail Price: Around $3,350 on bracelet
- Market Price Range: $2,100 to $2,900
TAG Heuer Formula 1 vs HydroConquest Specs Compared
| Specification | TAG Heuer Formula 1 Solargraph | Longines HydroConquest (2026) |
| Reference | WBY1111.BA0042 | L3.779.4.96.6 |
| Case Size | 38 mm | 39 mm or 42 mm |
| Case Thickness | 9.9 mm | 11.7 mm |
| Case Material | Steel with DLC, or TH-Polylight | Stainless steel |
| Bezel | TH-Polylight, bidirectional | Ceramic, unidirectional |
| Movement | Solar quartz TH50-00 | Automatic L888.5 |
| Power Reserve | Up to 10 months in darkness | 72 hours |
| Bracelet | Sandblasted steel or rubber | H-link steel or Milanese mesh |
| Clasp | Folding, no micro-adjust | Folding, four-position micro-adjust |
| Water Resistance | 100 m | 300 m |
| Crystal | Sapphire, anti-reflective | Sapphire, anti-reflective |
| Retail Price | $1,750 to $1,950 | $2,200 to $2,400 |
| Typical Market Price | $1,400 to $1,900 | $2,100 to $2,400 |
Which One to Buy: Formula 1 or HydroConquest
Both are well-built Swiss sports watches from serious brands. The right answer comes down to what you want from the watch on a normal Tuesday. If neither quite fits, our roundup of entry-level luxury picks widens the field.
Choose the TAG Heuer Formula 1 if:
- The 1986 design and the racing connection are what drew you in
- You want a watch that needs nothing from you, ever
- 38mm suits your wrist better than 39mm or 42mm
- You already own mechanical watches and want something different in the rotation
- Motorsport limited editions appeal to you as a collecting angle
- Your budget stops around $1,800
Choose the Longines HydroConquest if:
- You want a mechanical movement at this price
- You swim, dive, or spend real time around water
- Bracelet comfort over a long day matters to you
- You would rather buy the watch that holds its value
- You want a choice of two case sizes rather than one
- A ceramic bezel matters more to you than a heritage material
The tie-breaker: if this is your only watch, take the HydroConquest, because it does more and resells better. If it is joining a collection, the Formula 1 earns its place as the one you can grab without thinking.
Frequently Asked Questions
Is the TAG Heuer Formula 1 a real dive watch?
No, the Formula 1 is a water-resistant sports watch rather than a dive watch. Its bezel rotates in both directions, which means a knock can turn it backwards and make elapsed time read short. Dive bezels turn one way only for exactly that reason. Add the 100m rating on current models and it is built for pools, not depth.
Can you swap straps easily on either watch?
The HydroConquest is the easier strap watch, but only in 39mm. That size uses a standard 20mm lug width, which opens up almost every aftermarket strap made. The 42mm and the previous-generation 41mm both use 21mm, a much thinner market. The Formula 1 Solargraph is straightforward on rubber but the integrated look of the steel bracelet makes third-party swaps less satisfying.
Is the HydroConquest GMT worth the extra money?
Only if you cross time zones regularly. The jumping local hour hand is a genuine complication and priced fairly against Swiss rivals, but at around $3,350 retail it adds real cost over a three-hander. Frequent travelers get daily use from it. Everyone else is paying for a hand they will set once and forget.
What warranty do you get buying pre-owned?
Whatever remains of the original manufacturer warranty, and only if the card is dated and present. Longines runs five years on current models and TAG Heuer two, both from the date of first sale, so a 2026 full set may still have coverage left. Our explainer breaks down what coverage transfers and what doesn’t.
Where to Buy Authentic Watches Online
There are a few solid channels for buying either of these watches. Chrono24 carries the deepest inventory for both lines and shows asking prices across dealers and private sellers side by side, and we cover what to watch for on Chrono24 before you commit.
eBay works through its Authenticity Guarantee program, which puts a third-party check between you and the seller. Grailzee runs auction-format sales that occasionally turn up discontinued HydroConquest references below dealer money. Watch forums like WatchUSeek have active sales sections if you’re comfortable buying peer to peer.
We also buy, sell and trade luxury watches. What clients tell us makes the difference is the conversation before the purchase. We send tour videos of the actual watch on the wrist, not stock photos, along with detailed condition notes on the bracelet stretch, bezel marks and clasp feel that listing photos hide. You talk to someone who has held the watch.
That shows up in our 4.9-star Google rating, which mostly comes from people who wanted to know exactly what they were getting before wiring money. Where to source a pre-owned watch covers the rest of the channels.
If you’re weighing a Formula 1 Solargraph against a HydroConquest and want to see both in hand before deciding, reach out and we’ll put together tour videos and condition notes, or browse our current collection first.
Final Thoughts on TAG Heuer Formula 1 vs Longines HydroConquest
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Both of these watches got better in the last eighteen months, and the choice is now about temperament rather than value. If the racing side is what pulled you in, the wider TAG Heuer catalog is worth a look before you settle.
The Formula 1 is the watch you stop thinking about, which is a real kind of pleasure. The HydroConquest is the watch you notice every time you set it. Neither is the wrong answer.
Two things worth doing before you buy. Check the warranty card date on any HydroConquest listing, because it is the fastest way to confirm which generation you’re looking at. And ask a Solargraph seller how long it has been boxed, since a drained accumulator needs light before it will run properly.
