The SEA version comes in a 42 CARBONOX case, water resistant to 200 meters, perfect for no decompression air diving. The uni-directional turning bezel has a special diving zone count up marking, set off by a different colour (blue or orange) for easy reading. The screw-down crown has an orange rubber ring, for better grip, and the colour matches the markings on the bezel and the minute and second hands (the most visible colour for underwater work). The SEA series comes with a waved black rubber strap.