Tudor Chronograph 7031

The case measures 40mm 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.

Manual wind, Valjoux 7734. Power reserve is 45 hours. It beats at 18,000 vph. The movement uses 17 jewels.

It is rated to 50 meters, about 164 feet. That covers brief swimming. It is not a dive watch. 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.

Tudor produced this reference from 1970 to 1971. Production years matter when you are valuing one, because dial, bezel and bracelet details often changed inside a single reference run.

Oysterdate Chronograph 'Monte Carlo'. Collector nicknames are not official Tudor 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.