Transocean Chronograph Unitime Stainless Steel / Silver / Milanese

In Context

At 46 mm it is a large watch — well above this catalogue’s 40 mm median, and enough to dominate a narrow wrist. At 15.4 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. 100 m is genuine swimming resistance — more than the shape of this watch suggests it would need.

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.

AB0510U0.A790.152A stands on its own in this catalogue — no other reference here shares its base number. It pairs a silver dial with a stainless steel case. Beyond the time it carries a chronograph.

The B05 is the B01 chronograph with a world-time display: a city disc and a 24-hour ring that show the time in every zone at once. It powers 37 watches in this library, 34 of them the Transocean Chronograph Unitime. The base is the in-house [B01](/calibers/breitling-caliber-b01), a column-wheel chronograph with a vertical clutch, a 70-hour reserve and 28,800 vph, and the Unitime module adds 9 jewels to make 56. What sets it apart is the setting: pulling the crown and turning it moves the hour hand, the city disc and the 24-hour ring together, and the date follows, so a change of zone is a single adjustment rather than three. Every B05 is COSC-certified. In the library it sits under 34 [Transocean Chronograph Unitime](/brands/breitling/transocean) references, a 46 mm case in steel or red gold, and 3 Breitling for Bentley B05 Unitime references at 49 mm. One is a limited edition. The [B04](/calibers/breitling-caliber-b04) is the simpler second-time-zone version of the same base, the [B35](/calibers/breitling-caliber-b35) the world timer without a chronograph in the Galactic Unitime, and the [B03](/calibers/breitling-caliber-b03) the split-seconds derivative.

36 other watches in the library run the Breitling Caliber B05.

Breitling

Transocean Chronograph Unitime Red Gold / Black / Calf

RB0510U4.BB63.443X · 46 mm

Breitling

Transocean Chronograph Unitime Pilot Stainless Steel / Blue / Rubber

AB0510U9.C879.277S · 46 mm

Breitling

Transocean Chronograph Unitime Stainless Steel / Black / Milanese

AB0510U4.BE84.152A · 46 mm

Breitling

Transocean Chronograph Unitime Stainless Steel / Silver / Rubber

AB0510U0.A790.267S · 46 mm