BLS Factory Breitling Chronomat Automatic GMT 40 A32398101M1A1
The BLS Factory Breitling Chronomat Automatic GMT 40 A32398101M1A1 combines a 40mm stainless steel case with a 2836-based automatic GMT movement for displaying two time zones.
A rotating stainless steel bezel incorporates the characteristic raised rider-tab design, while the steel configuration uses a segmented rouleaux-style bracelet commonly referred to as a “bullet bracelet,” secured by a butterfly folding clasp.
The supplied range includes black, blue, green, white, anthracite grey and blue/yellow dial configurations, with steel bracelet and rubber strap options available depending on the version.
40mm Stainless Steel Case
The Chronomat Automatic GMT 40 features a 40mm stainless steel case.
Compared with larger sports-watch configurations, the 40mm diameter provides relatively compact proportions while retaining enough dial area for the additional GMT indication.
The steel construction also visually integrates with the rotating bezel and rouleaux-style bracelet on the full-steel configuration.
No confirmed case thickness was supplied, so an unverified measurement is not added.
2836-Based Automatic GMT Movement
This BLS Factory Chronomat GMT uses a 2836-based automatic mechanical movement with GMT functionality.
The movement provides conventional local-time indications together with an additional hand for referencing a second time zone.
Its automatic winding system allows normal wrist movement to contribute to replenishing the movement’s stored energy during regular wear.
Because the supplied specification identifies the underlying movement as a 2836 GMT configuration, no original Breitling caliber claim is made.
GMT Second Time-Zone Function
The additional GMT hand provides a second time reference alongside the primary local-time display.
This can be useful when traveling or when regularly communicating between two different time zones.
Rather than requiring a separate subdial, the second time reference is integrated into the primary dial through the additional GMT hand.
The exact independent-setting behavior of the GMT mechanism was not specified, so no unverified adjustment functionality is claimed.
Stainless Steel Rotating Bezel
The case is surrounded by a rotating stainless steel bezel.
The metal construction creates continuity with the steel case and bracelet while adding a functional rotating component around the dial.
The supplied information describes the bezel as unidirectional. This page therefore documents it according to the supplied BLS specification rather than adding functionality that was not provided.
Rider-Tab Bezel Design
A recognizable element of the Chronomat design is the raised rider-tab structure positioned around the bezel.
These raised elements create tactile and visual reference points while giving the bezel a more three-dimensional appearance than a conventional flat graduated ring.
The supplied information specifically identifies the characteristic 15-minute rider-tab arrangement.
Screw-Down Crown
The watch incorporates a screw-down crown.
The threaded construction allows the crown to be secured against the case after the time and GMT indications have been adjusted.
When operating the crown, it should be unscrewed and re-secured carefully to reduce the risk of cross-threading.
Avoid excessive force if unusual resistance is encountered.
Double-Gasket Crown Structure
According to the supplied configuration, the crown uses a double-gasket sealing structure.
These seals are designed to provide additional protection around one of the principal openings in the watch case.
However, no specific water-resistance depth or individual pressure-test result was supplied.
For that reason, this page does not assign an unverified water-resistance rating.
Rouleaux-Style Steel Bracelet
The full-steel configuration is fitted with a distinctive rouleaux-style stainless steel bracelet.
Its rounded individual sections create the cylindrical appearance that has led to the informal “bullet bracelet” description.
Compared with a conventional flat three-link bracelet, the segmented construction produces a different visual texture and allows multiple individual sections to articulate around the wrist.
The steel bracelet also maintains continuity between the case, bezel and bracelet materials.
Butterfly Folding Clasp
The rouleaux bracelet is secured using a butterfly-style folding clasp.
When closed, the clasp integrates into the underside of the bracelet and maintains a relatively continuous appearance.
The folding mechanism also keeps both sides of the bracelet connected when opened.
The clasp and individual bracelet sections should be inspected periodically for looseness or excessive wear.
Rubber Strap Option
In addition to the steel bracelet configuration, the supplied range includes a rubber strap option.
Rubber creates a lighter and more casual wearing configuration compared with the full-steel bracelet.
It also visually separates the 40mm steel case from the strap rather than continuing the metallic appearance around the entire wrist.
Exact rubber strap colors and clasp specifications were not supplied, so these details are not assumed.
Six Dial Color Options
The supplied BLS Factory range includes six dial color configurations:
* Black
* Blue
* Green
* White
* Anthracite Grey
* Blue / Yellow
The fundamental 40mm case and GMT architecture remain consistent across the supplied range, while the different dial colors change the visual presentation.
Because individual reference suffixes were not supplied for all six colors, this page does not assign unverified reference numbers to each variation.
Product Specifications
Item Specification
Factory BLS Factory
Brand Breitling
Collection Chronomat
Model Automatic GMT 40
Reference A32398101M1A1
Case Diameter 40mm
Case Material Stainless Steel
Movement 2836-Based Automatic GMT
Winding Automatic
Function Local Time / Second Time Zone
GMT Additional GMT Hand
Bezel Rotating Stainless Steel
Bezel Detail Rider Tabs
Crown Screw-Down
Crown Sealing Double-Gasket Structure
Bracelet Rouleaux-Style Stainless Steel
Bracelet Nickname Bullet-Style Bracelet
Clasp Butterfly Folding Clasp
Alternative Strap Rubber
Dial Options Black, Blue, Green, White, Anthracite Grey, Blue/Yellow
GMT and Wearing Characteristics
The combination of a 40mm case and GMT function gives this Chronomat a different positioning from the larger chronograph configurations.
Rather than using multiple chronograph counters, the dial incorporates an additional GMT hand to provide a second time-zone reference while maintaining a comparatively straightforward display.
For the steel configuration, the rounded rouleaux bracelet adds numerous articulation points around the wrist. The rubber configuration provides an alternative for users who prefer a lighter strap arrangement.
Wearing and Care Advice
When adjusting the GMT indication, operate the crown gently and avoid forcing the mechanism if unusual resistance is encountered.
After adjustment, carefully return the screw-down crown to its secured position.
The rouleaux-style bracelet should be cleaned periodically between its individual rounded sections, where dust and residue can accumulate.
Protect the 2836-based automatic movement from heavy impacts and strong magnetic fields.
Although the crown incorporates a double-gasket structure, no specific tested water-resistance depth was supplied. Professional pressure testing is recommended before swimming or other intentional water exposure.
Frequently Asked Questions
What size is the BLS Factory Chronomat Automatic GMT 40?
The supplied case diameter is 40mm.
What movement does this Chronomat GMT use?
It uses a 2836-based automatic mechanical movement with GMT functionality.
Can it display two time zones?
Yes. An additional GMT hand provides a second time-zone reference alongside the primary local time.
What is the “bullet bracelet”?
It refers to the rouleaux-style stainless steel bracelet, whose rounded segmented links create a cylindrical appearance.
Does it use a butterfly clasp?
Yes. The supplied steel bracelet configuration incorporates a butterfly-style folding clasp.
What dial colors are available?
The supplied range includes black, blue, green, white, anthracite grey and blue/yellow dial configurations.
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