Stainless steel case with a black (alligator) leather strap. Fixed stainless steel bezel with a black ion-plated ring showing tachymeter meter. Black dial with luminous silver-tone hands and index hour markers. Minute markers around the outer rim. Dial Type: Analog. Luminescent hands and markers. Chronograph - three sub-dials displaying: 60 second, 30 minute and 12 hour. Omega calibre 1861 hand wind movement, containing 18 Jewels, composed of 234 parts, bitting at 21600 vph, and has a power reserve of approximately 48 hours. Scratch resistant hesalite crystal. Pull / push crown. Solid case back. Round case shape. Case size: 42 mm. Case thickness: 14 mm. Band width: 20 mm. Band length: 9 inches. Fold over clasp with a push button release. Water resistant at 50 meters / 165 feet. Functions: chronograph, hour, minute, second, tachymeter. Additional Info: comes with a moonwatch presentation box which contains a "nato" strap, velcro strap, a tool to change the bracelet and a book on the speedmaster. Speedmaster Series. Dress watch style. Watch label: Swiss Made. Item Variations: 311 33 42 30 01 001, 311-33-42-30-01-001, 311/33/42/30/01/001, 31133423001001. Omega Speedmaster Professional Moonwatch Chronograph Watch 311.33.42.30.01.001