Amazon.com: [3-Pcs] For Casio F91W-1 Watch Screen Protector,Full Coverage Screen Protector for Casio F91W-1 / F-91W Watch HD Clear Anti-Bubble and Anti-Scratch : Cell Phones & Accessories
Casio F91W battery change, AC if display not working - YouTube
Casio Digital Watch Teardown - iFixit
Casio F-91W - Wikipedia
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