The IWC Deep One GST Ref. 3527 was introduced in 1999. It is the first diver's watch with a mechanical depth gauge up to 45 meters. The mechanical depth system is made of a coiled Bourdon tube, a pressure sensitive element that is independent from the watch movement. A limited series of roughly 500 examples were produced from 1999 to 2000. The present example is accompanied by the necessary test pump for the depth guage as well as a nylon strap for use over a dive suit.
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