Seiko Astron

The Seiko Astron, reference SSJ012J1, has a 39 mm steel case. The watch has a perpetual calendar. The case is 11 mm thick, with a lug-to-lug measurement of 46.2 mm and a water-resistance rating of 100 metres. Solar-powered calibre 3X22 contains 8 jewels; a sapphire crystal with a Super Clear coating covers the dial. The dial has a date display; the hands and indices carry LumiBrite. Movement accuracy is plus or minus 15 seconds per month without signal reception at temperatures between 5 and 35 degrees Celsius. The case has a hard coating; the lug width measures 21 mm. A leather strap has a three-fold clasp with push-button release.