Name: Chronomat B01 Chronograph 42
Brand: Breitling
SKU: AB0158101L1S1
Price: 263000 TWD
Availability: InStock

Question 1

What is the Breitling Chronomat B01 42?

Accepted Answer

The Chronomat B01 42 is the flagship automatic chronograph of Breitling's Chronomat collection — a Swiss luxury sports watch first introduced in 1984 and designed with pilots in mind. The "B01" denotes Breitling's in-house chronograph movement, while "42" is the 42 mm case diameter. It is instantly recognizable by its signature rider-tab bezel, screw-down crown and the rouleaux (rounded-link) bracelet, blending robust tool-watch engineering with refined finishing and 200 m water resistance.

Question 2

What materials, dial colors and bracelet does the Chronomat B01 42 use?

Accepted Answer

The 42 mm case is most often stainless steel, with two-tone steel-and-gold and full-gold executions also offered across the family. The unidirectional bezel carries Breitling's distinctive rider tabs and a graduated scale, and the watch is paired with the brand's signature rouleaux metal bracelet (a rubber version with the same look is also available). Dial colors span classic black, blue, silver and the well-known copper, with a date window and three chronograph counters in a balanced layout.

Question 3

Is the Chronomat B01 42 powered by an in-house movement and is it COSC-certified?

Accepted Answer

Yes. It is equipped with the Manufacture Caliber 01, Breitling's proprietary in-house automatic chronograph movement, featuring a column wheel and vertical clutch for crisp chronograph operation. It beats at 4 Hz (28,800 vph), offers approximately 70 hours of power reserve, and is officially COSC-certified, guaranteeing chronometer accuracy of -4/+6 seconds per day. The Manufacture Caliber 01 is widely regarded as one of the best in-house chronograph calibers at its price point and is visible through a sapphire caseback on many references.

Question 4

Is the Breitling Chronomat B01 42 water resistant?

Accepted Answer

The Chronomat B01 42 is water resistant to 200 metres (20 bar) and uses a screw-down crown, so it comfortably handles swimming and snorkelling in addition to everyday wear. Although it is a robust sports chronograph rather than a dedicated dive instrument, its high rating reflects the model's tool-watch heritage. Be sure the crown is fully screwed down before contact with water and have the seals checked at regular service intervals to keep the rating intact.

Question 5

How do I operate the chronograph and use the tachymeter on a Chronomat B01 42?

Accepted Answer

Press the pusher at 2 o'clock to start and stop the chronograph, and the pusher at 4 o'clock to reset it to zero. To use the tachymeter scale, start the chronograph as a measured object passes a start point, stop it after a known distance (typically one kilometer or mile), and read average speed where the seconds hand points on the scale. To set the watch, unscrew and pull the crown to the first position for the date and the second position for the time. Learn more about the Chronomat's history, design, and chronograph heritage on Breitling's dedicated Chronomat page.

Question 6

Does the Chronomat B01 42 need winding and how do I wind it?

Accepted Answer

It is a self-winding automatic, so normal wrist movement keeps the Manufacture Caliber 01 wound during daily wear. If the watch has been left unworn and has stopped, unscrew the crown and turn it clockwise around 30 to 40 times in the neutral position to build an initial reserve, then reset the time and screw the crown back down. With roughly 70 hours of power reserve, the watch will keep running for nearly three days off the wrist. Avoid over-winding once you feel firm resistance.

Question 7

What warranty does the Chronomat B01 42 come with and where should it be serviced?

Accepted Answer

It is a self-winding automatic, so normal wrist movement keeps the Manufacture Caliber 01 wound during daily wear. If the watch has been left unworn and has stopped, unscrew the crown and turn it clockwise around 30 to 40 times in the neutral position to build an initial reserve, then reset the time and screw the crown back down. With roughly 70 hours of power reserve, the watch will keep running for nearly three days off the wrist. Avoid over-winding once you feel firm resistance.

Chronomat B01 Chronograph 42

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