Superocean Heritage II B20 Automatic Beverly Hills Boutique

In Context

At 44 mm it is a large watch — well above this catalogue’s 40 mm median, and enough to dominate a narrow wrist. At 14.55 mm it is a tall case, and it will catch on a cuff. The case back is closed, so the movement stays out of sight, and the sapphire crystal will resist everything short of deliberate abuse. 200 m puts it in dive-watch territory, well past anything daily wear will ask of it.

The movement winds itself from the motion of your wrist. 70 hours of reserve is enough to set it down on Friday evening and find it still running on Monday. At 28,800 vph the seconds hand advances 8 times a second.

UB20303A1B1S1 stands on its own in this catalogue — no other reference here shares its base number. It pairs a black dial with a ceramic, red gold, stainless steel case.

The B20 is the three-hand automatic Breitling took from Tudor: the MT5612 with a Breitling rotor and finish, with a 70-hour reserve. It powers 97 watches in this library, 94 of them the Superocean Heritage II. The exchange was announced in 2017. Tudor received Breitling's [B01](/calibers/breitling-caliber-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](/brands/breitling/superocean-heritage) 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](/calibers/breitling-caliber-b31) is the in-house three-hander that succeeded it in 2025, and the [Caliber 17](/calibers/breitling-caliber-17) the ETA-based movement the Superocean Heritage ran before it.

96 other watches in the library run the Breitling Caliber B20.

Breitling

Superocean Heritage II B20 Automatic 42 Stainless Steel / Ice Blue / UK

AB20102B1B1S1 · 42 mm

Breitling

Superocean Heritage II B20 Automatic 42 Stainless Steel - Red Gold / Blue MOP / Boutique

UB20104A1C1S1 · 42 mm

Breitling

Superocean Heritage II 46 Stainless Steel / Bronze / Bronze / Aero Classic / Folding

AB202033/Q618/256S/A20D.2 · 46 mm

Breitling

Superocean Heritage II 46 Stainless Steel / Blue / Silver / Rubber / Folding

AB202016/G828/256S/A20D.2 · 46 mm