The world’s first GPS solar watch. By connecting to the GPS network, the Astron adjusts at the touch of a button to your time zone and, by taking all the energy it needs from light alone, never needs a battery change.

This gents Seiko Astron SSE139J features a titanium & ceramic case & strap, charcoal patterned dial with date and a perpetual calendar so you never have to worry about changing the date. It also has a dual time function and is 100m water resistant.