MODEL: 16600 S/NO: "D540xxx" SERIES YEAR 2005/06. Chronometer in stainless steel case 40mm, original Rolex stainless steel oyster bracelet @ 98% mint condition. Graduated rotatable stainless steel bezel fitted with glossy black insert. Special oyster case with gas escape valve for saturation diving & with shoulders to protect the trip lock winding-crown. Waterproof to 4000 feet. Automatic movement, without pinhole. (Discontinued model, highly collectible.)