MODEL:116660 S/NO: "AN" SERIES ROLEX BOX & CERT DATED JULY 2016. Chronometer in solid stainless steel case 44mm fitted with original Rolex stainless steel oyster bracelet. Graduated rotatable stainless steel bezel with ceramic insert. The special oyster case with gas escape valve for saturation diving and with shoulders to protect the Rolex trip lock winding-crown. Waterproof to 4000 feet. Automatic movement.