When Breitling introduced the Chronomat Automatic GMT, it filled a long-standing gap in the collection – a GMT model in a 40 mm size that made the Chronomat easier to wear every day. Until then, the lineup went from the 42 mm Breitling Chronomat GMT range straight to smaller three-hand pieces, leaving no mid-size option. This new 40 mm edition fills that space while adding one of the most useful travel functions: a second time zone.
Out of all the dial colors, the white dial quickly set itself apart. The white dial keeps things simple and clear, ready for trips abroad or your daily routine.
The Chronomat Automatic GMT 40 has become the go-to choice for those who wanted a mid-sized GMT with everyday wearability. But this release isn’t only about a fresh dial. It also reflects how Breitling has shaped the Chronomat into a true travel companion. Let’s look at where it came from and how it holds up on the wrist.
The Story Behind the Chronomat Automatic GMT 40
The Chronomat has been one of Breitling’s signature collections since its relaunch in 2020. With its rider-tab bezel, onion-shaped crown, and the signature rouleaux bracelet (a rounded-link “bullet style” bracelet unique to the Chronomat), it quickly became a recognizable part of the brand’s modern lineup. At first, the collection focused on larger chronographs and smaller three-hand models, so there was nothing sized between the 36 mm and 42 mm editions.
That changed in 2022 with the arrival of the Chronomat Automatic GMT 40. Positioned between the 36 mm and 42 mm models, it introduced a practical GMT complication while dropping the chronograph function. The result was the Breitling Chronomat Automatic GMT – a watch designed for travel and daily use, without the bulk of the larger versions.
With that background in place, it is time to look at the case and bracelet that define the feel of this edition.
How the Case and Bracelet Shape the GMT 40
The stainless steel case of the Chronomat GMT measures 40 mm across, 11.77 mm thick, and 47.4 mm lug-to-lug – dimensions that make it wearable for a wide range of wrists. The lugs feature brushed top surfaces, while the sides of the case are high-polished, giving the profile a nice shine under the light. Covering the dial is a slightly curved sapphire crystal, glareproofed on both sides, which keeps the display easy to read in any setting.
Framing the case is a unidirectional ratcheted rotating bezel, high-polished with 15, 30, and 45 markings cut into the bezel. At the 60-minute position, a blue luminous pip adds function and improves visibility in darker settings. The bezel also features rider tabs for grip, a signature detail of the Chronomat line. On the side, the crown (known as the Chronomat’s “onion” crown for its fluted dome shape) screws down securely with twin gaskets, helping the watch maintain its 200-meter water resistance. Together, these elements give the GMT 40 the toughness to handle travel and everyday use.
The rouleaux bracelet makes another appearance here – Breitling’s known design that has become as much a hallmark of the Chronomat as its bezel. The rounded links articulate smoothly, creating a comfortable fit that adapts well to wrist movement. On this version, the bracelet’s circular links feature brushed surfaces with high-polished accents, catching the light differently with each movement. Securing the bracelet is a butterfly clasp, while the 20 mm lug width allows collectors to explore strap changes for a more personal touch.
Now that we’ve looked at the case and bracelet, it is time to focus on what makes this model unique: the clean white dial of the Breitling Chronomat GMT.
A White Dial Built for Clarity
The crisp white dial gives the Breitling Chronomat GMT a personality of its own compared to the darker versions in the lineup. The hour markers are high-polished stick indices shaped like slim T’s, each filled with Super-LumiNova that glows bright green in low light. Matching them are high-polished silver-tone hands with luminous fill, ensuring the time remains easy to read even at night.
At the center, the full red GMT hand with a luminous triangle tip stands out immediately, circling the discreet 24-hour scale printed on the inner bezel. Just above the date window at 6 o’clock, the red “GMT” text ties the details together and reinforces the function at a glance. The date itself is neatly placed, keeping the layout symmetrical and uncluttered.
Additional touches bring character: the tip of the seconds hand carries lume for visibility, while the counterbalance features Breitling’s stylized “B” logo – a subtle brand signature that collectors will recognize.
Unlike reflective sunburst dials, the matte white finish keeps things simple and clear. It pairs well with almost any setting, casual or formal, making this white dial version a favorite among collectors who want a GMT that’s as practical as it is easy to read.
Of course, a dial this functional needs a reliable engine behind it – and that’s where the Caliber 32 comes in.
Inside the Chronomat: Breitling Caliber 32
Powering the Chronomat Automatic GMT 40 is the Breitling Caliber 32, a COSC-certified automatic movement based on the ETA 2893-2. It drives the hours, minutes, seconds, date, and a caller-style GMT hand – meaning the 24-hour hand can be adjusted independently while the local hour stays fixed.
This setup is especially useful for keeping track of a reference time zone, whether for coordinating with colleagues abroad or staying connected with family across continents. The movement runs at 28,800 vibrations per hour, uses 21 jewels, and provides a power reserve of around 42 hours, offering both accuracy and reliability in daily wear.
On the reverse side, the solid screwed-in caseback supports the watch’s 200-meter water resistance and adds to its durability. And while the bezel carries engraved 15, 30, and 45 markings, it functions as a standard 60-minute timing bezel rather than a 24-hour GMT scale – so this model is focused on tracking two time zones, not three.
While it isn’t a “flyer GMT”, the chronometer certification and practical design make it a strong everyday performer, especially for those who want a trusted travel companion.
But specifications only tell part of the story. The real impression comes when this watch is worn on the wrist.
The Comfort of a Slim 40 mm Chronomat
Wearing the Breitling Chronomat Automatic GMT 40 is easy – the 40 mm case and slim 11.77 mm profile create a size that feels natural all day. At 47.4 mm lug-to-lug, the case sits flat on the wrist, while the rouleaux bracelet (with its short, rounded links) wraps smoothly for a secure, comfortable fit. Collectors often point out how much lighter and more wearable this model feels compared to the larger Chronomat 42.
On the wrist, it comes across as light and easy, the kind of GMT you can keep on all day without feeling weighed down.
So, let’s bring the details together in a quick reference table.
Key Features of the White Dial GMT
| Feature | Description |
| Case | 40 mm stainless steel case, 11.77 mm thick, 47.4 mm lug-to-lug, brushed top surface of the lugs with high-polished case sides |
| Caseback | Solid stainless steel, screwed-in for durability and 200 m water resistance |
| Bracelet | Stainless steel rouleaux bracelet with rounded links, features brushed surfaces with high-polished accents |
| Clasp | Butterfly clasp for secure closure |
| Dial | Matte white dial with red “GMT” text above the 6 o’clock date window |
| Dial Design | High-polished stick (T-shaped) hour markers and silver-tone hands; red GMT hand with luminous triangle tip; 24-hour scale printed on the inner bezel; Breitling “B” logo on seconds hand counterweight |
| Lume | Super-LumiNova on hour markers, hands, GMT tip, and seconds hand tip; bright green glow |
| Bezel | Unidirectional ratcheted rotating bezel, high-polished with engraved 15/30/45 markers and a blue luminous pip at 60; fitted with rider tabs |
| Movement | Breitling Caliber 32 (COSC-certified, automatic, based on ETA 2893-2); 28,800 vph; 21 jewels; 42-hour power reserve; caller-style GMT with independently adjustable 24-hour hand |
| On-Wrist Feel | Slim and comfortable, sits flat on the wrist; bracelet wraps smoothly; noticeably lighter and easier to wear than the 42 mm Chronomat |
Should the Chronomat Automatic GMT 40 Be Your Next Pick?
Every traveler has that one item they carry that feels like part of their journey. For some it’s a passport cover, for others a pair of worn-in shoes. For watch enthusiasts, the Breitling Chronomat Automatic GMT 40 White Dial can be that companion. Its clean design and second time zone are reminders that you’re connected across borders, moving with purpose from one place to the next.
If you want a watch that doesn’t just tell the time but reflects the way you live and travel, this Chronomat makes a strong case for itself.
Curious to see more?
Watch our full hands-on video of the Breitling Chronomat Automatic GMT 40 White Dial here.
