Omega Seamaster Professional Chronometer 2531.80.00 Mens Watch. 41mm stainless steel case. Unidirectional stainless steel bezel with a blue bezel insert and luminous 60-minute marker. Blue dial with steel luminous hands and luminous dot hour markers. minute markers around the outer dial. Date display at the 3 O'clock position. Stainless steel bracelet with a double push button flip over clasp. Will fit up to a 7-inch wrist. stainless steel case back. Calibre 1120 automatic self-winding movement with 44-hour power reserve. Circa 1986. Original Papers Included. This watch is backed by our one year warranty.