Navitimer B02 Chronograph 41 Cosmonaute Porco Rosso

In Context

At 41 mm it is sized to the current mainstream: 40 mm is the median across every watch measured in this catalogue. At 13 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. Rated to 30 m, it is protected against rain and splashes and nothing beyond that.

The movement is hand-wound, so winding it becomes part of the day rather than something the watch does for you. 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.

AB02302A1B1P1 stands on its own in this catalogue — no other reference here shares its base number. It pairs a black dial with a stainless steel case. It was a limited edition. Beyond the time it carries a chronograph.

The B02 is the hand-wound version of Breitling's B01 chronograph with a 24-hour dial, made for the Navitimer Cosmonaute. It powers 15 watches in this library, every one a Cosmonaute. The 1962 Cosmonaute had a 24-hour dial so that Scott Carpenter could tell day from night in orbit, and it became the first Swiss wristwatch in space on his Aurora 7 flight; the modern Cosmonaute keeps the dial and the slide rule. The B02 is the in-house [B01](/calibers/breitling-caliber-b01), a column-wheel chronograph with a vertical clutch and a 70-hour reserve at 28,800 vph with 47 jewels, with the rotor removed and the hour hand geared to turn once a day. It is COSC-certified. In the library it powers 15 [Navitimer](/brands/breitling/navitimer) Cosmonaute references: 9 at 43 mm from the 2010s and 6 of the Navitimer B02 Chronograph 41 Cosmonaute of 2022. 7 are limited editions. The [B01](/calibers/breitling-caliber-b01) is the automatic base, and the [B09](/calibers/breitling-caliber-b09) the hand-wound B01 with a conventional dial in the Premier Heritage and the AVI Ref. 765.

14 other watches in the library run the Breitling Caliber B02.

Breitling

Navitimer B02 Chronograph 41 Cosmonaute Stainless Steel - Platinum / Japan

PB02302A1B1A · 41 mm

Breitling

Cosmonaute Blacksteel / Black / Rubber / Folding

MB0210B6/BC79/200S/M20DSA.2 · 43 mm

Breitling

Cosmonaute Stainless Steel / Blue / Bracelet

AB0210B4/C917/447A · 43 mm

Breitling

Cosmonaute Stainless Steel / Black / Croco

AB0210B4.BC36.743P · 43 mm