A rare and genuinely cool late-1970s Tissot Seastar that captures the whole “Genta-influenced” sports-watch era in one sharp, angular package. The case is bold and architectural, dominated by an unusual 10-sided bezel that gives the watch a technical, almost industrial look – exactly what made this generation of Swiss toolwatches so desirable again today. This example stands out not only for its design, but also for its clever GMT / time-zone function, operated directly from the crown. It’s a quartz toolwatch with character, real function, and strong wrist presence – helped by a modern-wearable 22 mm lug width. GMT / time-zone function (how it works) The Seastar “GMT” concept here is built around independent hour correction (great for travel): you can jump the hour hand in steps while keeping the minutes (and therefore accuracy) intact. In practice, you set the watch precisely once (minutes), then when changing time zones you adjust only the hour/date – fast, convenient, and very “toolwatch” in spirit. Specifications Brand: Tissot Model: Seastar Quartz Year: 1977 (serial 20525xxx) Reference model number: 40641 Movement: Tissot quartz module Cal. 2030 Functions: Hours, minutes, central seconds, date; GMT / time-zone hour adjustment via crown Case: Stainless steel, Genta-influenced angular toolwatch design Bezel: Unusual 10-sided bezel; restored grey rhodium plating Crown: Signed “T” crown with push-function control Dial: Silver brushed finish with applied markers; date at 3 Crystal: Mineral Strap: Leather strap (22 mm) Servicing and Warranty Fully serviced with disassembly in our Bristol shop Mechanics in full working order 12-month movement warranty Warranty Terms and Conditions No water resistance warranty