• I've got a similar era G-Shock and the case back is held on with screws around the perimeter, battery is readily available and I've changed it a few times with no mishaps. Happy to take a look if you want me to when you get it back?

  • I can second that.. 1998ish G-Shock which I sent back to Casio for battery changes for the first decade or so.. since then I’ve changed the battery a few times myself with little fuss and no issue around water ingress (I’ve swum in it many times since, not dived)

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