Amazon.com: Casio F91WG-9 Men's Retro Black Band Gold Face Alarm Chronograph Digital Watch : Clothing, Shoes & Jewelry
Casio watch battery replacement - YouTube
Casio F-91W | Hackaday
Casio F91W Battery Replacement - YouTube
Casio F-91W - Disassembly and Battery Replacement - YouTube
Casio F-91W purchased Mar-2016. Wristband was rubbish and broke in 1 year, replaced with nato style nylon band. Has been bashed against concrete, submerged in river. Will update in another 4 years