Caliber B20

About the Breitling Caliber B20

The exchange was announced in 2017. Tudor received Breitling's B01 chronograph as the MT5813 for the Black Bay Chrono, and Breitling received the MT5612, made by Kenissi, as its first three-hand movement with a modern specification: a free-sprung balance with a silicon hairspring, a balance bridge anchored on both sides rather than a cock, 28,800 vph, 26 jewels, 31.8 mm across and 6.5 mm high, and 70 hours from a single barrel. Every B20 is COSC-certified.

It launched the Superocean Heritage II in 2017 and stayed with it: 94 of the 97 references here are Heritage IIs, 58 of them in the 46 mm case, 27 in 42 mm and 12 in 44 mm. Three more are AVIs. 13 of the references are limited editions.

The B31 is the in-house three-hander that succeeded it in 2025, and the Caliber 17 the ETA-based movement the Superocean Heritage ran before it.