Seiko Astron

The Seiko Astron, reference SSJ013J1, has a 41.2 mm titanium case. The watch has a perpetual calendar and a power reserve indicator. The case is 12 mm thick, with a lug-to-lug measurement of 48.5 mm and a water-resistance rating of 100 metres. Solar-powered calibre 3X63 contains 10 jewels and operates for approximately 6 months when fully charged. The dial is covered by a sapphire crystal; the dial has a date display. LumiBrite is applied to the hands and indices. Movement accuracy is plus or minus 15 seconds per month without signal reception at temperatures between 5 and 35 degrees Celsius. A three-fold clasp with push-button release and fine adjustment fastens the watch.