Longines HydroConquest with a grey sunray dial in the 39mm size. The HydroConquest is Longines' dive watch line, rated to 300m. Automatic movement, ceramic bezel insert, screw-down crown. 39mm is the smaller of the two sizes they offer, which suits slimmer wrists or people who prefer watches that don't dominate.

Where does Longines sit?

Above Tissot, below Omega all three are owned by Swatch Group. You get a Swiss automatic movement with a decent power reserve and proper dive watch credentials. The grey dial on this one is more versatile than the standard blue or black. Works with a suit or a t-shirt. From Baker Brothers, an authorised dealer, so full manufacturer warranty applies.