Rolex. A rare stainless steel automatic calendar bracelet watch Model: Double Red Sea Dweller Reference: 1665 Date: Circa 1972 Movement: 26-jewel Cal.1570 automatic, free-sprung Glucydur microstella balance, adjusted to 5 positions & temperature, No.D483797 Dial: Matte black Mark IV, 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, inside back stamped I.72, calibrated bezel, No.3543269 Strap/Bracelet: Brushed and polished 93150 Oyster link, 580 end links Buckle/Clasp: Signed folding clasp, stamped VC Signed: Case, dial & movement Size: 40mm Accompaniments: Rolex box, outer card (AF), International Service Guarantee card Footnotes: The 'Double-Red' Sea-Dweller reference 1665 appeared in the Rolex catalogue from 1972 until 1975. The nickname refers to the two red printed lines on the dial. The 'Sea-Dweller 2000' was one of the first production watches to employ a gas-escape valve on the band of the case, which allows the interior of a watch to decompress and avoids damage. The one way valve automatically releases built up gas from inside the case when the diver rises from the deep sea environment without which the watch would be in danger of popping the seals. Interestingly, the plexi glass covering the dial did not feature the usual cyclops magnifying the date window as it adds a pressure point which would cause a weakness. For further information on this lot please visit Bonhams.com