MODEL: 16600 S/NO: "M316xxx" SERIES BOX & CERT DATED OCT 2011. Chronometer in stainless steel case 40mm, original Rolex stainless steel oyster bracelet @ 100% mint condition. Graduated rotatable stainless steel bezel fitted with a glossy black insert. The special oyster case with gas escape valve for saturation diving and with shoulder protecting the Rolex trip lock winding-crown. Waterproof to 4000 feet. Automatic movement, without pinhole. (Discontinued model, highly collectible.)