Caliber B31

About the Breitling Caliber B31

Until it arrived, every three-hand Breitling ran an ETA, Sellita or Tudor base. The B31 is Breitling's own: an automatic with a date, 28.4 mm across and 4.8 mm high, with 26 jewels, a beat of 28,800 vph and a 78-hour reserve from a single barrel, certified by the COSC. Its reserve and its thinness are the points, and it is the movement Breitling now builds its slimmer three-handers around.

In the library it powers 22 Superocean Heritage references, the B31 Automatic in 42 mm and 44 mm, and 7 Top Times at 38 mm and 40 mm. Cases run from 38 mm to 44 mm, with 42 mm the most common. 4 are limited editions.

The B20, the Tudor-built movement, is what it replaced in the Superocean Heritage, the Caliber 17 the ETA base before that, and the B01 the in-house chronograph it now sits beside.