The Omega Marineline was launched in 1932; the case was patented as No. 146.310, granted on March 10, 1930. The Marine was the first watch to be tested at a depth exceeding 70 meters. In 1936 an Omega Marine descended to a depth of 73 meters for 30 minutes in the Lac Léman; the temperature at maximum depth was 5 degrees Centigrade. Upon returning to the surface, the watch was in perfect working order. Available in steel, 9k, 14k or 18k such as this example. With the clasp stamped with the matching last 2 numbers of the case ensuring its originality, this example has been very well preserved.