BLS Factory Breitling Premier B01 Chronograph 42 Automatic Watch
The BLS Factory Breitling Premier B01 Chronograph 42 combines a classic twin-register chronograph layout with a 7750-based B01-style automatic mechanical movement operating at 28,800 vibrations per hour.
Its exterior design incorporates a smooth fixed bezel, streamlined rectangular chronograph pushers and applied Arabic numerals, creating a different visual character from the more instrument-oriented Navitimer and Avenger collections.
A sapphire crystal protects the dial, while the crown uses a non-screw-down construction with a double-gasket sealing system.
Premier Collection Design
The modern Premier collection draws visual inspiration from Breitling chronographs associated with the 1940s.
Rather than emphasizing a rotating sports bezel or aviation slide rule, the design uses a cleaner case and dial architecture.
Key visual characteristics include the smooth fixed bezel, twin chronograph registers, rectangular pushers and prominent Arabic numerals.
These elements give the Premier B01 Chronograph 42 a more traditional chronograph appearance while retaining mechanical elapsed-time functionality.
42mm Case
The Premier B01 Chronograph features a 42mm case diameter.
The size provides sufficient dial area for the twin-register chronograph arrangement, central hands, date display and Arabic hour numerals.
Compared with chronographs using three subdials, the two-register architecture also leaves more uninterrupted space across the main dial.
No confirmed case thickness or material was included in the supplied information, so these specifications are not added.
7750-Based B01-Style Automatic Movement
This BLS Factory configuration uses a 7750-based automatic chronograph movement modified with a B01-style architecture and appearance.
The movement provides conventional mechanical timekeeping together with automatic winding and chronograph functionality.
Normal wrist movement contributes to replenishing the movement’s stored energy during regular wear.
Because the supplied information identifies the underlying movement as a modified 7750, it is not described as an original Breitling Manufacture Caliber B01.
28,800 VPH Frequency
The supplied movement specification lists an operating frequency of 28,800 vibrations per hour (vph).
This corresponds to 4 Hz, or eight semi-oscillations per second.
Movement frequency is one of the technical specifications describing how rapidly the regulating system oscillates during operation.
Actual timekeeping accuracy can still vary according to regulation, movement condition, winding state, temperature and wearing position.
Twin-Register Chronograph Layout
A defining feature of this Premier configuration is its two-register chronograph layout.
The two subdials create a relatively symmetrical dial architecture and distinguish the model from conventional three-register chronographs.
The chronograph mechanism allows elapsed time to be started, stopped and reset using the corresponding rectangular pushers.
Exact individual subdial assignments were not supplied, so they are not independently assumed.
Rectangular Chronograph Pushers
The chronograph controls use streamlined rectangular pushers positioned alongside the crown.
Their elongated geometry differs visually from conventional round chronograph pushers and contributes to the more formal exterior architecture of the Premier collection.
The pushers should be operated normally without excessive pressure.
If unusual mechanical resistance is encountered, the chronograph controls should not be forced.
Smooth Fixed Bezel
The case incorporates a smooth fixed bezel.
Unlike a diving watch or GMT configuration, this bezel does not provide an additional rotating timing scale.
Its simpler surface keeps visual attention focused on the chronograph dial and Arabic numerals.
The fixed architecture also differentiates the Premier from the rotating bezels found on many sports-oriented Breitling configurations.
Applied Arabic Numerals
The dial incorporates three-dimensional Arabic hour numerals.
Their raised construction creates additional depth across the dial and provides clear visual reference points around the twin-register chronograph layout.
The numerals also contribute to the vintage-influenced character associated with the Premier design.
Date Display
A date window is integrated into the dial.
The calendar indication operates alongside the standard time and chronograph functions of the 7750-based movement.
The supplied information specifically notes attention to the visual dimensions and appearance of the date display, but no independently verified comparison measurements were supplied.
For that reason, no claim of dimensional identity with another watch is made.
Non-Screw-Down Crown
This configuration uses a non-screw-down crown.
Unlike a threaded crown, it can be operated without first unscrewing it from the case.
This simplifies access when winding the movement or adjusting the time and calendar.
The non-screw-down architecture should not be confused with the screw-down crown systems used on some Avenger and other sports-watch configurations.
Double-Gasket Crown Structure
Although the crown is not screw-down, the supplied specification identifies a double-gasket sealing structure.
These seals provide additional protection around the crown opening.
However, gasket construction alone does not establish a specific water-resistance depth.
Because no tested water-resistance figure was supplied, an unsupported depth rating is not added.
Sapphire Crystal
The dial is protected by a sapphire crystal.
Sapphire provides high resistance to everyday surface scratches while maintaining good optical transparency.
This allows the twin chronograph registers, Arabic numerals and calendar indication to remain clearly visible.
Despite its high surface hardness, sapphire should still be protected from concentrated impacts against hard objects.
Folding Clasp
The supplied configuration incorporates a folding clasp.
A folding mechanism keeps the strap connected when opened and reduces repeated bending compared with a conventional pin-buckle arrangement.
No confirmed strap material was provided in the supplied information, so leather type, color or other unverified strap details are not added.
Product Specifications
Item Specification
Factory BLS Factory
Brand Breitling
Collection Premier
Model B01 Chronograph 42
Case Diameter 42mm
Movement 7750-Based B01-Style Automatic
Winding Automatic
Frequency 28,800 vph / 4 Hz
Chronograph Mechanical
Dial Layout Twin Register
Hour Markers Applied Arabic Numerals
Date Yes
Bezel Smooth Fixed Bezel
Pushers Rectangular Chronograph Pushers
Crown Non-Screw-Down
Crown Sealing Double Gasket
Crystal Sapphire Crystal
Clasp Folding Clasp
Style Automatic Dress Chronograph
Movement and Chronograph Architecture
The combination of the 7750-based automatic movement and twin-register display forms the primary mechanical configuration of this BLS Factory Premier.
The movement operates at 28,800 vph and supports the mechanical chronograph together with the standard time and calendar indications.
Visually, the twin-register architecture provides a cleaner arrangement than a three-register chronograph, while the fixed bezel and rectangular pushers reinforce the more traditional appearance of the Premier collection.
Wearing and Care Advice
Protect the 7750-based automatic chronograph movement from strong magnetic fields and heavy impacts.
Operate the rectangular chronograph pushers normally and avoid forcing them if unusual resistance is encountered.
Because the crown is non-screw-down, do not attempt to thread or tighten it against the case.
Use a clean microfiber cloth for routine cleaning of the sapphire crystal and exterior surfaces.
No specific water-resistance depth was supplied. Professional pressure testing is recommended before any intentional water exposure.
Frequently Asked Questions
What size is the BLS Factory Breitling Premier B01 Chronograph?
The supplied case diameter is 42mm.
What movement does this version use?
It uses a 7750-based automatic chronograph movement with a B01-style configuration.
What is the movement frequency?
The supplied specification is 28,800 vibrations per hour, equivalent to 4 Hz.
How many chronograph subdials does it have?
This configuration uses a twin-register or two-subdial chronograph layout.
Is the crown screw-down?
No. The supplied configuration specifies a non-screw-down crown with a double-gasket sealing structure.
What type of crystal does it use?
The watch is fitted with a sapphire crystal.
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