Rolex. Montre bracelet en acier avec date mouvement automatique Rolex. A stainless steel automatic calendar bracelet watch Model: Sea-Dweller Reference: 1665 Date: Circa 1978 Movement: 26-jewel Cal.1570 automatic Dial: Black, luminous dot hour markers, baton quarters, white outer minute divisions, date aperture at 3, polished Mercedes hands with luminous inserts, centre seconds Case: Brushed and polished tonneau form, screw down back and shouldered crown, helium escape valve at 9, calibrated bi-directional bezel, No.5721695 Strap/Bracelet: Brushed 93750 Oyster link, end links stamped 585 Buckle/Clasp: Signed folding clasp, stamped I4 Signed: Case, dial & movement Size: 40mm Footnotes: The Rolex Sea-Dweller was first launched in the 1960's having been specially developed for deep-sea divers. Saturation divers who had previously been issued with Rolex Submariners found that during decompression, the pressure inside the watch would force its way out through the weakest point which usually resulted in the loss of the plexiglass. In response to this, Rolex developed the Sea-Dweller. With a helium escape valve on the side, a greater depth rating of 610 meters and the removal of the cyclops from the crystal, the Sea-Dweller is a true tool watch and has been favoured by professional divers ever since its introduction. For further information on this lot please visit Bonhams.com