Aquis Date 01 733 7730 4134-07 4 24 64EB 43.5mm

The black Aquis Date 43.5 on black rubber — 01 733 7730 4134-07 4 24 64EB — is about as plain as a Swiss diver gets, and that’s the appeal. Nothing to explain at the counter.

This is the stealth option: black dial, black ceramic bezel insert, black rubber. It’s a favourite of buyers who actually dive or fish, since the rubber strap shrugs off saltwater and sun. Retail sits around $2,100–$2,300, a couple of hundred under the bracelet version.

Specs are the 43.5mm Aquis standard: Calibre 733 automatic with 38 hours of reserve, 300m water resistance, screw-in crown, unidirectional bezel, sapphire crystal, exhibition caseback. Lume on the hands and indices is generous.

If you sell to a sporty or outdoor crowd, this and the blue-dial 4135 on rubber are the two to keep in stock together.