Omega Seamaster 231.10.42.21.01.001

The case measures 41.5mm across, with a 20mm lug width. Case material: 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.

Caliber 8500. Power reserve is 60 hours. It beats at 25,200 vph. The movement uses 39 jewels.

It is rated to 150 meters, about 492 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.

Omega produced this reference from 2011 to 2017. Production years matter when you are valuing one, because dial, bezel and bracelet details often changed inside a single reference run.

Seamaster Aqua Terra 150M Co-Axial. Collector nicknames are not official Omega names, but they are what people actually search for and what they are called across a showroom.

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.