Breitling Transocean A4531012/G751

The case measures 43mm across and 12.72mm thick. Case material: Stainless steel. Case size alone is a poor guide to how a watch wears; lug-to-lug length and how the bracelet drops off the case matter more, which is why we suggest trying one on before you commit.

Automatic, Breitling Caliber 45 (NOT in-house: ETA 2834-2 base), COSC chronometer. Power reserve is 40 hours.

It is rated to 100 meters, about 328 feet. That is enough for swimming and snorkeling, but not for scuba diving. One caution that applies to every watch on this page: a water resistance figure describes a new watch with fresh gaskets. On a piece that is years past its last service, treat the rating as unknown until it has been pressure tested.

Characters 2-3 = caliber (10-49 mechanical, 50+ quartz; a 'B' in front of the number marks an in-house Breitling caliber, its absence marks a third-party base); character 4 = COSC status (3 = chronometer-certified); characters 5-6 = model; characters 7-8 = case/bezel finish; the code after the slash is the dial. So A-45-3-10-12 = steel case, Caliber 45 on a third-party base, COSC, model 10; /G751 is the Mercury Silver dial. The red-gold version of the same watch carries the R prefix (R4531012). Breitling does not publish this scheme. It is compiled from collector documentation and reads as a reliable guide rather than a manufacturer specification.. Reading the reference is the fastest way to confirm that a watch is what the seller says it is, before you get anywhere near the movement.

Yes. We buy this reference outright, and we lend against it if you would rather keep it. We are a family-owned San Diego buyer established in 2006, our appraisers are GIA-trained, and the appraisal is complimentary with no obligation to sell. You can bring it to our Gaslamp showroom at 907 Sixth Ave or start online. If you are looking to buy this reference instead, tell us and we will let you know when one comes in.