This is a Tissot "Navigator" World Time Automatic Waterproof SS (stainless steel) model, manufactured in the 1950s. It is a rare World Time model created in 1953 to commemorate the brand's 100th anniversary. The watch features a disk at the center of the dial with the names of various cities, which works in conjunction with a 24-hour scale and the hands to allow the wearer to determine the time in different countries.
A button positioned at 2 o'clock enables the setting of local time and home time. The unique two-tone dial, a hallmark of the World Time design, combines both functionality and aesthetic appeal, making it an innovative masterpiece even by today's standards.
Various versions of this model exist, including those made of solid 14k or 18k gold, with snap-back or screw-back cases. This particular model is crafted from stainless steel and features a screw-back case, making it highly practical. It is equipped with the bumper automatic movement Cal. 28.5N-21T.