70s silver watch cuff

This 1970s modernist silver cuff watch has an oval black dial set into a smooth, sweeping band that curves up around the case and opens at the back to slip onto the wrist. It dates from an era when many rare watch cuffs were designed, especially in silver, and this model was only produced until the 1980s. It runs on a Swiss Ébauches Bettlach mechanism, which is currently working but a little slow, so it is sold as it is, and I can have it fixed for an extra fee upon request. The silver is in good condition with only light scratching.