The Seiko AL20 quartz watch movement is a ladies two hand caliber with hour and minute measuring 6¾ × 8 lignes or 15.30 × 17.80 mm with a thickness of 2.99 mm. This 0 jewel movement uses hand sizes 110/65 operates on a 377 battery and uses stem part number 354 788 with a 0.90 mm tap 10 thread.