B12

	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.

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