BLS Factory Breitling Chronomat 42mm Automatic Chronograph Watch
The BLS Factory Breitling Chronomat combines a 42mm case with a 7750-based automatic chronograph movement and a distinctive rouleaux-style stainless steel bracelet.
Often referred to as a “bullet bracelet” because of the rounded shape of its individual links, the bracelet uses a segmented construction with smooth transitions between each section.
A butterfly clasp maintains a relatively clean appearance when the bracelet is closed, while longitudinal brushing across the case introduces additional contrast between the different exterior surfaces.
42mm Case
The BLS Factory Breitling Chronomat features a 42mm case, providing balanced proportions for an automatic mechanical chronograph.
The diameter creates sufficient dial area for the primary time indications and chronograph displays while maintaining the characteristic proportions of the Chronomat design.
At 42mm, the case also provides a substantial connection point for the segmented steel bracelet.
No confirmed case thickness was supplied, so an unverified measurement is not added.
Longitudinal Brushed Finish
The case incorporates a longitudinal brushed surface treatment.
Fine brushing lines run consistently across the relevant exterior surfaces, creating a more subdued appearance than a fully polished case.
This finishing also introduces visual separation between differently treated components when the watch is viewed under changing light.
Surface brushing should be maintained carefully, as aggressive polishing can alter the direction and appearance of the original finishing pattern.
7750-Based Automatic Chronograph Movement
This BLS Factory Chronomat uses a 7750-based automatic mechanical chronograph movement.
The movement combines normal mechanical timekeeping with an integrated chronograph function for measuring elapsed time.
Automatic winding allows normal wrist movement to contribute to replenishing the movement’s stored energy during regular wear.
Because the supplied information identifies the underlying movement as a 7750-based construction, this page does not describe it as an original Breitling manufacture caliber.
Mechanical Chronograph Function
The mechanical chronograph provides an additional elapsed-time function beyond normal hour, minute and seconds indications.
The chronograph can be started, stopped and reset using the corresponding controls on the case.
Because a mechanical chronograph contains additional interacting components compared with a conventional three-hand movement, its pushers should be operated normally without excessive force.
No specific subdial arrangement or timing capacity was supplied, so those details are not assumed.
Rouleaux-Style Steel Bracelet
One of the most recognizable exterior characteristics of this Chronomat configuration is its rouleaux-style stainless steel bracelet.
The bracelet consists of rounded individual sections that create the distinctive cylindrical appearance sometimes informally described as a “bullet bracelet.”
Rather than using conventional flat three-link construction, the rounded segmented architecture gives the bracelet a noticeably different appearance from standard sports-watch bracelets.
The multiple articulating sections also allow the bracelet to follow the shape of the wrist.
Rounded Link Construction
Each section of the bracelet uses a rounded profile with smooth edge transitions.
This creates continuity between adjacent links while maintaining the individually segmented appearance associated with the rouleaux design.
The rounded architecture is particularly visible when the bracelet curves around the wrist, where the individual sections articulate independently.
Regular cleaning between the links can help prevent dust and residue from accumulating within the articulated structure.
Butterfly Clasp
The bracelet is secured using a butterfly-style folding clasp.
When closed, the clasp structure is integrated into the bracelet and helps maintain a relatively continuous appearance across the underside of the wrist.
Opening the clasp separates the bracelet through its folding mechanism rather than requiring a conventional pin buckle.
The clasp and bracelet connection points should be inspected periodically for excessive wear or looseness.
Case and Bracelet Integration
The relationship between the 42mm case and rouleaux-style bracelet is an important part of the Chronomat’s exterior design.
The rounded bracelet sections contrast with the straighter brushed surfaces of the case, creating different textures across the watch.
As light moves across the exterior, the segmented bracelet and longitudinal case brushing produce different reflections without relying entirely on polished surfaces.
This combination gives the watch a distinctive appearance from both the front and side.
Product Specifications
Item Specification
Factory BLS Factory
Brand Breitling
Collection Chronomat
Case Diameter 42mm
Case Finish Longitudinal Brushing
Movement 7750-Based Automatic Chronograph
Winding Automatic
Chronograph Mechanical
Bracelet Stainless Steel
Bracelet Style Rouleaux / Bullet-Style
Bracelet Construction Rounded Segmented Links
Clasp Butterfly Folding Clasp
Style Automatic Chronograph
Bracelet and Wearing Characteristics
The rouleaux-style bracelet is one of the main distinctions between this configuration and watches using conventional Oyster-style or three-link steel bracelets.
Its multiple rounded sections create numerous articulation points, allowing the bracelet to curve progressively around the wrist.
Because the watch uses a 42mm case, correct bracelet sizing is important for keeping the case centered and reducing unnecessary movement during wear.
Individual fit will depend on wrist circumference and the number of bracelet sections installed.
Wearing and Care Advice
Use a clean microfiber cloth for routine cleaning of the case and bracelet.
When cleaning the rouleaux-style bracelet, pay particular attention to the spaces between individual sections where dust and residue can accumulate.
Avoid aggressive polishing on the longitudinally brushed case surfaces, as this can alter the original brushing direction.
Protect the 7750-based automatic chronograph movement from heavy impacts and strong magnetic fields.
Operate the chronograph controls normally and avoid forcing a pusher if unusual resistance is encountered.
No confirmed water-resistance specification was supplied, so intentional water exposure is not recommended without appropriate pressure testing.
Frequently Asked Questions
What size is the BLS Factory Breitling Chronomat?
The supplied case diameter is 42mm.
What movement does this Chronomat use?
It uses a 7750-based automatic mechanical chronograph movement.
What is a rouleaux or bullet-style bracelet?
It is a bracelet constructed from multiple rounded segmented links. The cylindrical appearance of the individual sections has led to the informal “bullet bracelet” description.
What material is the bracelet?
The supplied specification identifies a stainless steel bracelet.
What type of clasp does it use?
The bracelet incorporates a butterfly-style folding clasp.
What type of case finishing is used?
The supplied information specifies longitudinal brushing across the relevant case surfaces.
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