Purpose-built for underwater use. The visual language of diving watches is unmistakable: rotating bezels, lume-filled indices, and durable construction.
42mmTudor MT5602 -- in-house automatic GMT, 28,800bph, 70h PR, 26j; METAS-certified, bidirectional winding; used in Black Bay GMT and Pelagos FXD2021–present
42mmJLC Cal. 956 -- in-house automatic with alarm, 28,800bph, 45h PR, 39j; used in Polaris Memovox; gong-and-hammer alarm, winding via the crown2018–present
40.5mmMido Caliber 80 Si -- ETA C07.621 base with silicon hairspring, 21,600bph, 80h PR, 21j; improved anti-magnetic and anti-shock vs standard Caliber 802020–present
42mmSellita SW200-1 -- Swiss automatic, ETA 2824-2 functional equivalent, 28,800bph, 38h PR, 26j; used across many mid-range tool watch brands2014–present
41mmTudor MT5602 -- in-house automatic GMT, 28,800bph, 70h PR, 26j; METAS-certified, bidirectional winding; used in Black Bay GMT and Pelagos FXD2017–present