Case material: Steel; Charge: Automatic; Conditions: Excellent Presentation condition : With dealer guarantee ; Model: Seamaster Price on request Gmtbroker Reference: 2918.50.82 The Seamaster Planet Ocean - Discontinued Model Beyond the requisites of a professional diver’s watch (300 meters/1000 feet) this model is water resistant to 600 meters/2000 feet. Other features that distinguish this as a professional diver’s instrument are the screw-in crown and screw-down case back, the helium escape valve, the fluted uni-directional rotating bezel featuring a luminous dot and the highly visible hands on the dial. Positioned at 10 o’clock and embossed with the chemical symbol for helium “He”, the helium escape valve allows any atoms of this gas to escape during decompression. This is a vital function when using a diving bell, as minuscule helium atoms are able to penetrate the case and could damage the watch when expansion occurs during decompression. The chronograph push-buttons, made of steel and decorated with a colored aluminum ring, are functional to 600 metres/2000 feet while the domed scratch-resistant sapphire crystal has received an anti-reflective treatment on both sides for optimum clarity. The matt black dial offers excellent contrast thanks to applied luminous hour markers and the use of Arabic numerals in orange at 12, 3, 6 and 9 o’clock. The date window is positioned between 4 and 5 o’clock. The facetted rhodium-plated arrowhead hour and minute hands have SuperLuminova inserts and a highly visible orange tip further enhances the