Steel on rubber strap , Steel Deployant Clasp. Reference 2900.50.81 Includes 2 day FedEx insured signature required shipping To the CONUS. Open to Offers. Red arrows in photos indicate any obvious scratches or wear marks. Watch was Purchased new from US Omega AD 03/2009. Watch was serviced by Omega in 2015 and continues to run within COSC specs at approximately +5 sec/ day. Small scratches minor dings consistent with age are present. Includes outer box, inner box, Instruction manual, pictograms, chronometer certificate, warranty card , Seamaster polishing cloth and hang tag. New Silicon rubber Strap from Omega. Copies of original purchase receipt, service receipt, and strap receipt available. References available on request. Wire Transfer preferred, Returns only if not as described. Automatic Movement 2500C Power reserve: approx. 48 hours Screwed down case back Sapphire crystal anti glare on one side only Bezel: Unidirectional Crown: Screw down Helium escape valve Water Resistance 600m / 2000ft Diameter : 45.5 mm Lug Width: 22 mm Lug to Lug 50 MM Thickness: 15. 5 mm Caliber