Omega Seamaster Diver 300M Co-Axial Master Chronometer 42 mm watch. Model reference: 210.30.42.20.01.010. Stainless steel case. Black dial. Automatic movement. Stainless steel bracelet. Swiss made. The watch comes in the original packaging, with a set of documents and warranty. At Watches of Mayfair we offer new authentic watches at the best prices.