The Submariner is the reference every dive watch since 1953 has been measured against, and the shape most people picture when they picture a wristwatch. The case is the argument: a screw-down crown and caseback sealing an Oyster case, a unidirectional bezel that can only ever understate remaining air, and a date under the Cyclops. Water resistant to 300m. In Rolesor — Rolex's steel-and-gold construction — the gold is solid, not plated, which is why the bezel and centre links wear differently from the steel around them. What matters on examination: whether the case has been polished, since the sharp transition between the lug top and flank is the first casualty and cannot be put back; bezel insert originality and the crispness of its action; bracelet stretch, measured rather than eyeballed; and on Rolesor, wear through the gold on the centre links. Service history, box and papers are confirmed through the desk. Maker: Rolex. Reference: 126613LB-0002. Available through ELITA's private desk — verification review, discreet handling and storage. Price on request.