Navitimer 8 B35 Automatic Unitime 43 Stainless Steel / Silver / Blue Croco / Folding

In Context

At 43 mm it is a large watch — well above this catalogue’s 40 mm median, and enough to dominate a narrow wrist. At 14.35 mm it is a tall case, and it will catch on a cuff. The case back is open, so the movement is visible without taking the watch apart, 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.

AB3521U01G1P4 stands on its own in this catalogue — no other reference here shares its base number. It pairs a silver sunburst dial with a stainless steel case. Introduced in 2018.

The B35 is Breitling's in-house world timer, introduced in 2015 in the Galactic Unitime and the first in-house Breitling movement without a chronograph. It powers 21 watches in this library. A city disc and a 24-hour ring show the time in every zone at once, and the crown sets all of it together: pulling it and turning moves the hour hand, the city disc and the ring in one adjustment, with the date following. It is 36.6 mm across and 7.8 mm high with 41 jewels, a 70-hour reserve and a beat of 28,800 vph, and it is COSC-certified. In the library it powers 12 [Galactic Unitime](/brands/breitling/galactic) references at 44 mm, including the SleekT editions with a tungsten bezel, and 9 Navitimer 8 Unitime references at 43 mm in the [AVI](/brands/breitling/avi) collection. One is a limited edition. The [B05](/calibers/breitling-caliber-b05) is the world timer with a chronograph, on the B01 base, and the glossary defines the simpler [GMT](/glossary/gmt) display.

20 other watches in the library run the Breitling Caliber B35.

Breitling

Navitimer 8 B35 Automatic Unitime 43 Stainless Steel / Silver / Blue Croco

A3521U01G1P2 · 43 mm

Breitling

Galactic Unitime Stainless Steel / SleekT / Trophy Black / Croco

WB3510U4/BD94/743P · 44 mm

Breitling

Galactic Unitime Stainless Steel / SleekT / Trophy Black / Calf

WB3510U4.BD94.433X · 44 mm

Breitling

Galactic Unitime Stainless Steel / SleekT / Antarctica White / Military

WB3510U0.A777.109W · 44 mm