Seiko 5 Sports

The Seiko 5 Sports, reference SBSA139, has a 39.4 mm steel case. The case is 13.2 mm thick, with a lug-to-lug measurement of 48.1 mm and a water-resistance rating of 100 metres. Self-winding calibre 4R36 contains 24 jewels and has a power reserve of approximately 41 hours. The dial is covered by a curved Hardlex crystal. The dial has a date display and a day display. The clasp has a three-fold construction with push-button release; LumiBrite appears on the hands and indices. Movement accuracy is plus 45 to minus 35 seconds per day; the watch has magnetic resistance. A display back reveals the movement.