This special edition commemorates Certina’s membership in the Sea Turtle Conservancy, which is devoted to the conservation of the sea turtle and its habitats. It was established in 1959, the same year Certina debuted its DS “Double Security” concept. Furthermore, the watch is conform to the ISO 6425 standard for diving watches by using special O-ring seals in the crown and case back. As a professional diver’s watch, it is water resistant to 300 metres, and has a screw-down crown, screw-down case back and a unidirectional bezel with Super-LumiNova coating markings for high readability. It contains the automatic ETA Powermatic 80 movement, noted for its remarkable 80-hour power reserve. The blue seconds hand is a reference to the Sea Turtle Conservancy, the official logo of which is featured on the case back.