B04

	Brand:	Breitling
	Family:	Breitling B01 Family
	Height:	7.20 mm
	Jewels:	47
	Reserve:	70 hours
	Frequency:	28,800 A/h
	Winding:	Automatic
	Diameter:	30.00 mm (13.25 ligne)
	Complications:	2-Button, 24 Hour Hand, 6-Column Chronograph, Chronograph, Column Wheel Chronograph, Date, GMT Hand, Independently-Adjustable 12 Hour Hand, Instant Date Change, Quick Date Correction, Vertical Clutch Chronograph
	Hands:	12 Hour Chronograph Hand at 6:00, 30 Minute Chronograph Hand at 3:00, Central 24 Hour Hand, Central 60 Second Chronograph Hand, Central Hour 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: 2011 – Current
1910s	1920s	1930s	1940s	1950s	1960s	1970s	1980s	1990s	2000s	2010s	2020s

Calibre B04 is an automatic chronograph movement with GMT hand produced by Breitling since 2011.

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.

Cal. B04 adds a GMT hand to the basic Cal. B01. This added complication requires no additional height or jewels.

Functions and Complications

Cal. B03 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 12-hour hand is independently adjustable backward and forward independently of the minute hand, while the 24 hour GMT hand runs with the minute hand.

Cal. B04 Applications

Breitling used Cal. B04 in a large number of watches starting in 2011. Most were in the Chronomat series, though it was also used in Bently, Transocean, Navitimer, and Chronoliner ranges.

• Breitling for Bentley B04 GMT
• Breitling Chronoliner B04
• Breitling Chronomat 44 GMT
• Breitling Chronomat 47 GMT
• Breitling Navitimer GMT
• Breitling Transocean Chronograph GMT

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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