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B12

Last Update: November 15, 2020

Brand:Breitling
Family:
Breitling B01 Family
Height:7.30 mm
Jewels:47
Reserve:70 hours
Frequency:28,800 A/h
Winding:Automatic
Diameter:30.00 mm (13.25 ligne)
  Complications:2-Button, 6-Column Chronograph, Chronograph, Column Wheel Chronograph, Date, Instant Date Change, Quick Date Correction, Vertical Clutch Chronograph
Hands:12 Hour Chronograph Hand at 6:00, 15 Minute Chronograph Hand at 3:00, Central 24 Hour Hand, Central 60 Second Chronograph Hand, Central Minute Hand, Date Window at 4:30, Small Seconds Hand at 9:00
Distinguishing Technical Characteristics
Counter-Clockwise Balance Cock
6-Column Chronograph
Balance at 4:30
Column Wheel at 10:30
Production: 2016 – Current
1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s

Calibre B12 is an automatic chronograph movement with a 24 hour hand produced by Breitling since 2016.

Breitling introduced their calibre 01 (commonly called Cal. B01) in April 2009 in the Chronomat. It is a modern automatic chronograph movement with a column wheel and vertical clutch. It operates at 28,800 A/h, boasts a power reserve of 70 hours, and is a COSC-certified chronometer. The movement shares many characteristics with the Rolex Cal. 4130, and it has been reported that many of the same engineers worked on both movements.

Functions and Complications

Cal. B12 modifies the basic Cal. B01 in that the central hour hand traces 24 hours in a day rather than 12 hours twice. Thus it requires a special dial with 24 hour markings. The movement is 0.10 mm thicker at 7.30 mm.

Cal. B12 features the following displays on the dial:

  • 30 minute chronograph counter at 3:00
  • Date window at 4:30
  • 12 hour chronograph counter at 6:00
  • Small seconds at 9:00

The 24-hour hand is independently adjustable backward and forward independently of the minute hand.

Cal. B12 Applications

Breitling has only used Cal. B12 in the Avenger Hurricane 24H models.

Breitling B01 Family Overview

Starting in 2017, Breitling began supplying a version of Cal. B01 to Tudor. The resulting movement, Cal. MT5813, has a free sprung balance with a silicon hairspring, as is common in modern Rolex and Tudor movements. It is also decorated differently. Strangely, it is often quoted as having different dimensions: 30.40 mm diameter and 7.23 mm thickness.

CalibreYear
Introduced
JewelsHeightWindingDateComplications
B01200947 or 417.20AutomaticYesSome Without Hour Counter
B022013?47ManualYes24 Hour
B032017479.15AutomaticYesSplit Seconds
B042011477.20AutomaticYesGMT
B052013?56AutomaticYesWorld Time
B06201547AutomaticYes30 Sec Chrono
B092019?47ManualNo
B122016477.30AutomaticYes24 Hour
MT58132017417.23AutomaticYesNo Hour Counter
Images are taken from official publications and are used here for commentary and educational purposes. Copyright is held by the original owner as noted.
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