ROLEX, SEA-DWELLER 4000, Oyster Perpetual Date, Sea Dweller 4000, Ref. 16600, movement no. 3 0746000, case no. D547370, sold in 2006 A superb condition and full-set, water-resistant, tonneau-shaped, automatic, stainless steel certified chronometer diver’s wristwatch with gloss black dial, luminous indexes and hands, date, sweep center second, unidirectional rotating bezel with decompression time, helium escape valve, stainless steel Oyster bracelet with secured deployant clasp. Fitted with a caliber 3135, rhodium-plated, self-winding, shock-absorbers, 31 jewels, hack mechanism, screwed case back and Triplock crown, helium escape valve in the band, sapphire crystal. Dial, case and movement signed. Diam. 39.50 mm. Thickness 14.60 mm. Approx. overall length for bracelet 190 mm. Accompanied by a fitted presentation box and outer packaging, decompression table card, Submariner booklet dated 2005, clasp extension L (LARGE), tool, original guarantee dated February 2006. Reference 16600/16660 replaced reference 1665 in 1986. The primary differences are the 1mm thick sapphire crystal, second generation gas-escape valve and uni-directional revolving bezel. In original superb condition and completed with all its accessories, this vintage diving watch has aged very nicely.