In 1958, the Master Mariner line was created for the American market. It was rapidly enlarged with many new models, including several chronometers. Nine years later, the first diving models were introduced. Housed in a patented Super Compressor case, of which 1532 were made, the Master Mariner Barracuda was water resistant down to a depth of 200 metres. Made in a series of 551 examples, the Master Mariner Dolphin is one of the very rare diving watches aimed at an exclusively female clientele.