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Ultimately a new bezel for it, (someone makes good aftermarket copies) and I'll use it as an everyday beater. It's a bit of a mish mash of parts from different sources; it isn't technically the right module for the case, but it fits and the buttons match the functions. The case has a big chip, but it's on the inside and a replacement crystal is near impossible to find (Casio changed the size and shape over the years). I think it adds character, personally!
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Casios can do some weird things on installing a new battery, and you're being more adventurous than I would with the circuitry. I have zero experience or tools to deal with that, although I keep possibly dead modules (just in case). I'm surprised there's differences in the modules; that series only used the 261 (says Google) so I can only specuate on what and why things were changed
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I've yet to find a single resource for info; calibre corner gives technical information on analogue movements (quartz and mechanical), shockbase for G Shocks (good for checking part compatibility), watchUseek often crops up on searches, even if it's others asking the same question. If there's a code to interpreting Casio module numbers, I've not cracked it yet
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The G Shocks are a bit of a hobby; the early ones can get quite pricey on ebay, and I like the challenge of sourcing parts and getting them going again. The 5610 gets the most wrist time, solar power and time signal means the only button that gets pressed is the light. I've got a couple of Citizen quartz divers in my basket, for future projects and the Casio analogue homages are simple and fun to work on. I'm planning to use a Seiko VH31 movement in one (MTD 1010) to have a sweep hand and the benefit of a quartz.
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It can be possible; there was a "Just One More Watch" video where he did it, albeit with a Dremel on a Seiko
Link-me-do
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@Kimmo Good luck with the restoration. I dabble in bringing the odd watch back to life, principally G Shocks from the 80s and Seikos of often unknown vintage. It's often the case that components from 2 or more Casios need to be combined to make a whole watch; I believe they make certain replacement parts for 15 years and once they're gone, that's it. Hope this encourages you in some way, it was in a right state when I got it, but luckily it was mostly cosmetic
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I'm annoyed at myself for ordering the (slightly) wrong size watch crystal; I can only think I managed to have my calipers out of zero when I originally measured it. If nothing else, it wasn't expensive and another easily found and, of course, it can sit in the spares box until I need it