The Vacheron Constantin Overseas Perpetual Calendar Ultra-Thin (Ref. 4300V/000R-B509) with a blue dial is the kind of watch that instantly sparks interest among collectors. It’s ultra-slim at just 8.1 mm, yet it packs a perpetual calendar that won’t need adjusting until the year 2100 and a moon phase built with real gold detail. Its quick-change strap system makes it simple to swap between the rubber strap for casual days and leather for dressier settings, keeping it ready for any occasion.
Beyond the slim profile, this piece shows why Vacheron Constantin is so respected. The movement meets the Hallmark of Geneva standard, the case is built with antimagnetic protection, and the design carries the brand’s iconic Maltese cross bezel. It is a high-complication watch that still feels practical to own and easy to wear.
To see why this watch exists and where it fits in the Overseas story, let’s look back at how the line evolved and why this model stands out today.
How the Overseas Perpetual Calendar Ultra-Thin Came to Life
The Overseas line debuted in 1996 as Vacheron Constantin’s answer to the luxury sports watches dominating the market – pieces like the Audemars Piguet Royal Oak and Patek Philippe Nautilus. It gave the brand a modern, travel-ready design while staying true to its Swiss heritage. Two decades later, in 2016, the collection entered its third generation with slimmer cases, stronger antimagnetic protection, and the now-famous quick-change strap system – a feature Vacheron introduced well before most competitors.
That same year marked a milestone: the launch of the Overseas Perpetual Calendar Ultra-Thin. It used Vacheron’s celebrated Calibre 1120, a movement originally derived from the revered JLC 920 architecture that also powered high-end models from what collectors call the “Holy Trinity” of Swiss watchmaking – Vacheron Constantin, Audemars Piguet, and Patek Philippe. Fitting this complex perpetual calendar into a case just 8.1 mm thick showed how far the brand had pushed practical watch engineering.
In 2018, Vacheron expanded the line with pink gold models, giving the watch a richer tone and a more luxurious wrist presence compared to the earlier white-gold versions. One year later, the reference 4300V/000R-B509 arrived, introducing the sunburst blue lacquer dial and delivering the watch on both rubber and leather straps right from the box – a combination that made this high-complication model more approachable for everyday wear.
Now that we know its history, it’s time to see how the case and strap make this ultra-thin perpetual calendar surprisingly easy to wear.
Pink Gold Case and Quick-Swap Strap System Explained
The 41.5 mm case is made from 18K 5N pink gold, a warm-toned alloy that keeps its rich color over time. Despite the precious metal, it feels manageable on the wrist thanks to its ultra-thin 8.1 mm profile. The case offers 50 m of water resistance and includes a soft-iron inner ring for antimagnetic protection (around 25,000 A/m) – useful for everyday exposure to electronics.
The dial is protected by a scratch-resistant sapphire crystal that offers excellent clarity and glare control. The Maltese cross-inspired bezel mixes high-polished outer facets with brushed recesses underneath, creating contrast when light hits. The case sides are high-polished, while the top of the lugs are brushed, giving a subtle tool-like texture without losing the luxury feel.
On the right side, a pink gold crown with fine fluting for grip and a polished Maltese cross logo makes winding and setting easy. Around the case edge, small recessed corrector pushers sit at roughly 2, 4, 8, and 11 o’clock – each dedicated to adjusting the perpetual calendar’s date, day, month/leap year, and moon phase. They stay neatly flush with the case so they don’t disrupt the clean profile but remain easy to access with the supplied corrector tool.
Vacheron’s interchangeable strap system is one of the watch’s most practical features. Pull-tabs hidden under each band let you swap between options in seconds – no tools needed. The full set includes a dark blue rubber strap for active use, a matching blue alligator leather strap with white stitching for dressier days, and a solid 18K pink gold bracelet when you want an all-metal look. Each strap is fastened by a high-polished pink gold folding clasp with a twin-trigger release that feels solid yet easy to operate, while the bracelet integrates its own hidden clasp.
Around back, a transparent sapphire caseback reveals the beautifully finished Calibre 1120 QP/1, with its 22k gold compass rose rotor clearly on display as it winds the watch.
After exploring the case and strap, let’s turn to the dial, the stage where this perpetual calendar shows its full personality.
The Blue Sunburst Dial and Its Smart Calendar Layout
The sunburst satin-finished blue lacquer dial is what immediately sets this model apart. Its surface shifts from deep navy to vivid cobalt as light moves across it, while a crisp white minute track circles the edge on a subtle velvet-textured ring. Each of the three subdials has a concentric azurage pattern (thin circular grooves that catch light and create a subtle sense of layering) giving the displays clear separation without making the dial feel crowded.
Time is read via rose gold hour and minute hands with white luminous centers that glow blue in the dark, paired with slim rose gold baton hour markers – each a rectangular stick with a white luminous center framed in gold for clear low-light visibility. A high-polished rose gold central seconds hand keeps the main dial clean and precise.
The perpetual calendar shows its information in a four-way layout that keeps the dial well organized:
- Month and leap-year cycle at 12 o’clock
- Date at 3 o’clock
- Day of the week at 9 o’clock
- Moon phase at 6 o’clock, set just above the printed “Vacheron Constantin Genève” signature and featuring two gold moons on a starry blue sky.
Even with its many displays, the dial feels straightforward – the date, day, month, and moon phase are easy to find and understand.
Having explored the dial’s layout and legibility, it is time to see what powers all these displays inside the slim case.
The Ultra-Thin Engine: Calibre 1120 QP/1
Inside the 4300V/000R-B509 beats the Calibre 1120 QP/1 – a self-winding perpetual calendar movement just 4.05 mm thick. Its base design traces back to the legendary Jaeger-LeCoultre 920, a movement so exclusive it was reserved for the watchmaking “Holy Trinity”. Vacheron has refined it with modern finishing and full Hallmark of Geneva certification, a seal that now covers the entire watch, not just the movement.
To keep the case slim yet durable, the movement is protected by a soft-iron inner ring rated to about 25,000 A/m, shielding it from everyday magnetism (phones, laptops, speakers). Automatic winding comes via a 22K gold rotor engraved with a detailed compass rose and mounted on a peripheral beryllium ring riding on ruby rollers – a design that keeps the caliber thin, smooth to wind, and resistant to shock.
Key specs collectors appreciate:
- Automatic winding with a 40-hour power reserve
- 2.75 Hz beat rate (19,800 vph) for energy efficiency
- Adjusted in five positions for accuracy
- Perpetual calendar accurate until 2100 (leap years included)
- Moon phase requiring adjustment only once every 122 years if kept running
Viewed through the transparent sapphire caseback, the finishing is classic Vacheron: Geneva stripes, polished anglage, perlage on the baseplate, solarized crown and ratchet wheels, and mirror-polished screw heads with chamfered slots – all beautifully executed despite the movement’s extreme thinness.
For owners, setting the calendar is straightforward once you know the basics (but avoid adjusting when the hands are between 6 PM and 10 AM, as the date-change mechanism could be engaged).
Here’s a simplified guide collectors often follow:
- Quick time/date reset – Pull the crown to the second position, turn the hands clockwise to reach the correct day and date, then push back.
- Month & leap year – Use the upper-right corrector; each press advances the month by one and shows the leap-year cycle (marked “L”).
- Date – Use the upper-left corrector to advance the date one day at a time.
- Day of the week – Use the lower-left corrector to move the weekday forward.
- Moon phase – Use the lower-right corrector to match the current moon cycle (reference a moon calendar).
- Final time set – Pull the crown again to the second position, turn to the correct time, and push back to running mode.
Once adjusted, the watch tracks leap years and month lengths automatically and won’t need attention until 2100. The moon phase stays accurate for over a century if kept running.
Now that we understand the engine driving it, let’s look at the experience of wearing this ultra-thin watch.
Wearing the Ultra-Thin Overseas
At 41.5 mm, this watch surprises many collectors with how naturally it wears. The ultra-thin case lets the strap drop straight down from the lugs instead of flaring out, so it sits securely even on wrists around 14 cm. Its 49 mm lug-to-lug length and slim 8.1 mm height keep the profile controlled and balanced, while the light build for an 18K pink gold watch avoids the top-heavy feel thicker gold models can have.
The dark blue rubber strap is soft and pliable, featuring a Maltese cross-inspired pattern on top and a relief underside that flexes easily for long wear. Swapping to the included blue leather strap with white stitching takes only seconds thanks to Vacheron’s tool-free quick-change system. The high-polished pink gold folding clasp uses a secure twin-trigger release, staying locked during wear but easy to operate and transfer between straps.
On the wrist, the blue lacquer dial shifts from deep navy indoors to vibrant cobalt in bright light, while the Maltese cross bezel mixes polished and brushed surfaces for subtle visual play without feeling flashy. The overall experience is light, well-balanced, and comfortable enough for daily use – impressive for a high-complication gold watch.
With the wearing experience clear, let’s run through the key specs at a glance before wrapping up.
Key Specifications: Vacheron Constantin Overseas Perpetual Calendar Ultra-Thin Blue Dial (Ref. 4300V/000R-B509)
|
Category |
Details |
|
Case |
41.5 mm diameter, 8.1 mm thick, 18K 5N pink gold |
|
Case Details |
Alternating brushed and high-polished surfaces; brushed top lugs, high-polished sides; discreet calendar correctors on case edge; soft-iron inner ring for 25,000 A/m magnetic resistance |
|
Water Resistance |
50 m (suitable for light water exposure but not swimming) |
|
Crystal |
Scratch-resistant sapphire with anti-reflective treatment |
|
Caseback |
Transparent sapphire exhibition back showing the decorated movement |
|
Bezel |
Maltese cross-inspired design in 18K 5N pink gold |
|
Bezel Details |
High-polished outer facets with brushed recesses for light play and subtle contrast |
|
Dial |
Sunburst satin-finished blue lacquer |
|
Dial Details |
White minute track on a velvet-finished ring; three subdials with fine concentric azurage (month/leap year at 12, date at 3, day at 9); moon phase just above “Vacheron Constantin Genève” at 6; rose gold hour and minute hands with white luminous fill (blue glow); slim polished seconds hand; rectangular gold hour markers with luminous white centers |
|
Crown |
Pink gold push-down crown with fluted grip and Maltese cross logo |
|
Strap |
Dark blue rubber strap with Maltese cross pattern and relief underside, matching blue alligator leather strap with white stitching, and solid 18K 5N pink gold bracelet; all use Vacheron’s quick-change system for tool-free swapping. |
|
Clasp |
High-polished 18K pink gold folding clasp with twin-trigger release |
|
Movement |
Vacheron Constantin Calibre 1120 QP/1 – automatic, 4.05 mm thick, based on the legendary JLC 920 |
|
Movement Details |
22K gold rotor with engraved compass rose on peripheral beryllium ring supported by ruby rollers; Hallmark of Geneva certified; 40-hour power reserve; 2.75 Hz (19,800 vph); adjusted in 5 positions; perpetual calendar accurate until 2100; moon phase needs correction only once every 122 years |
|
On-Wrist Feel |
Light for a gold watch, balanced on wrists as small as 14 cm; slim profile and straight-down strap fit keep it controlled; dynamic blue dial and subtle bezel finishing give presence without heaviness |
Now that the specs are clear, let’s bring the story together and point readers to a closer look.
Is This the Right Ultra-Thin Perpetual Calendar for You?
All the calendar information you need (day, date, month, leap year, and moon phase) is arranged cleanly on a rich blue sunburst dial that moves from deep navy indoors to a vivid cobalt in bright light. At just 8.1 mm thick, the 18K pink gold case wears low and close to the wrist, avoiding the bulky, top-heavy feel that many high-complication watches can have.
This is a watch for people who stay on the move and value practicality without giving up prestige. It’s equally practical for work, travel, and special occasions. Instead of sitting untouched in a safe, it is built to be lived with – a true ultra-thin perpetual calendar you can wear and enjoy every day.
See how the Vacheron Constantin 4300V000R-B509 wears and discover the details up close in our full video tour here.
