Seiko SSB313

The Seiko reference SSB313 is a chronograph with a 42.7 mm steel case. The case measures 13.9 mm thick, with a water-resistance rating of 100 metres. Quartz calibre 8T67 has a battery life of approximately 36 months. Over the dial is a curved Hardlex crystal; the dial has a date display. The clasp has a three-fold construction with push-button release. Movement accuracy is plus or minus 15 seconds per month. The lug width measures 21 mm; elapsed time is measured in increments of 1/5 second. The hands and indices carry LumiBrite.