Caliber B03

About the Breitling Caliber B03

A rattrapante is the most demanding of the chronograph complications, because the two seconds hands must run together, separate on a press, and catch up on the next. Breitling built its version on the in-house B01, keeping the column wheel, the vertical clutch and the 70-hour reserve, and added its own mechanism for isolating and re-engaging the split hand, which the company patented. The movement runs at 28,800 vph with 47 jewels and is COSC-certified.

Every reference here is the Navitimer Rattrapante of 2017, a 45 mm case in steel or red gold with the slide-rule bezel, 39 references in all, 12 of them limited editions.

The B04 and B05 are the other B01 derivatives, with a second time zone and a world-time display, and the glossary defines the chronograph itself.