Seiko Astron SSH161

The Seiko Astron SSH161 is a men's GPS solar watch. Astron takes its name from the Seiko Quartz Astron of 1969, the world's first quartz wristwatch.

It runs on Seiko caliber 5X83, a GPS solar movement that sets itself by satellite signal and is charged by light. The movement has 14 jewels. Fully charged, it runs for approx. 6 months (up to approx. 2 years in power-save mode). Rated accuracy is ±15 seconds per month (without receiving a GPS signal and at temperatures between 5°C and 35°C). Functions include overcharge prevention, power save, chronograph up to 12 hours in 1/20 second increments, perpetual calendar to the February 28, 2100, world time function (38 cities) and dual-time among others.

The titanium case, finished with a super-hard coating, measures 42 mm wide, 12.4 mm thick and 49.5 mm from lug to lug. Lug width is 14 mm. The dial is protected by sapphire crystal, with a super-clear coating. Seiko's LumiBrite luminous paint is applied to the hands and indexes for legibility in the dark. It comes with an easy-adjust three-fold clasp with push button release. Other details include allergy-safe metal and screw case back.

The watch is water resistant to 100 m (10 bar). It weighs 106 g.