B03

	Brand:	Breitling
	Family:	Breitling B01 Family
	Height:	9.15 mm
	Jewels:	47
	Reserve:	70 hours
	Frequency:	28,800 A/h
	Winding:	Automatic
	Diameter:	30.00 mm (13.25 ligne)
	Complications:	3-Button Chronograph, 6-Column Chronograph, Chronograph, Column Wheel Chronograph, Date, Instant Date Change, Quick Date Correction, Split Seconds Chronograph, Vertical Clutch Chronograph
	Hands:	12 Hour Chronograph Hand at 6:00, 30 Minute Chronograph Hand at 3:00, Central Hour Hand, Central Minute Hand, Central Split Second Chronograph 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: 2017 – Current
1910s	1920s	1930s	1940s	1950s	1960s	1970s	1980s	1990s	2000s	2010s	2020s

Calibre B03 is an automatic rattrapante chronograph movement produced by Breitling since 2017.

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. B03 adds a split seconds (rattrapante) mechanism, and is one of the most common rattrapante movements in recent times. This added function adds just under 2 mm height to the movement, bringing it to 9.15 mm. The split seconds button is located coaxially in the crown, an unusual but aesthetically beneficial design.

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 rattrapante hand is controlled using a button located coaxially inside the crown.

Cal. B03 Applications

Breitling used Cal. B03 in a number of Navitimer Rattrapante models starting in 2017. Most were unlimited pieces and were available in a large number of dial, case, and strap configurations.

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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