MODEL: 1665 S/NO: "6xxxxxx"
Chronometer in stainless steel case 40mm, original Rolex stainless steel flip lock oyster bracelet. Graduated rotatable bezel. Special oyster case with gas escape valve for saturation diving & with shoulders to protect the trip lock winding-crown. Waterproof to 610 m / 2000 feet. Auto movement 1570, acrylic crystal. (Discontinued model, highly collectible.)