Casio STR-300 Module 2575 Quartz Lap Memory 60 Wrist Watch 50m Sport Alarm | eBay
CASIO, Black , Resin , 16mm , Casual Sport , Number 684 (684 EJ1 16 >Pur< ) is on underside of both parts of band, Module 2575 , STR-300S-1V, 10186122, - Walmart.com