Seiko SSB331

The Seiko reference SSB331 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 and small seconds. The clasp has a three-fold construction with push-button release; movement accuracy is plus or minus 15 seconds per month. The case has a hard coating; the lug width measures 21 mm. Elapsed time is measured in increments of 1/5 second. LumiBrite is applied to the hands and indices.