SEAMASTER DIVER 300M SUMMER BLUE COLLECTION. The case back features the Seamaster logo depicting a trident-bearing Poseidon and two seahorses: OMEGA’s 1956 original and the brand’s current design. Brushed stainless steel case with polished beveled corners. Polished stainless steel crowns. Helium escape valve located on the case edge at the 10 o'clock position. Bezel: Stainless steel uni-directional turning bezel. Polished blue ceramic bezel insert. Summer Blue enamel diving scale. Luminous dot at the starting point. Dial: Summer blue gradient dial made of zirconium oxide ceramic. With [ZrO2] engraved on the dial directly below the center hands. Laser engraved wave design. Applied polished hour markers with Summer Blue colored luminous fill. Fine printed minute/seconds track. Polished hands with Summer Blue colored luminous fill. Date window located at 6 o'clock. Movement: Omega Master Co-Axial caliber 8800, beats at 25,200 vph, contains 35 jewels & has an approximate power reserve of 55 hours. METAS Certified Master-Chronometer: The assembled watch, with its COSC certified Chronometer movement, passes rigorous tests that replicate real-life conditions. The METAS certification tests water resistance, precision and magnetic resistance. Anti-magnetic: resistant to magnetic fields greater than 15,000 gauss. Features Omegas Si14 silicon balance spring & Co-Axial Escapement. The rotor & visible bridges are decorated with a unique arabesque wave design finish. AKA: 21032422003002