IF all else fails(sometimes somebody has hopelessly crossthreaded one):
1.Drill a hole right over one or both of the batteries, then you can start tearing out the back with a pair of pin nose pliers(I'm assuming not everyone owns metal nibblers). Eventually you'll be able to get the back to pull out, at which point you can take out the undamaged module and then carefully cut the ring in half with a Dremel cut-off wheel at the notch where the case back locks in or you can use a carbide or diamond burr to cut the ring at the same place.
2.[Case be damned method]Cut at 60 degrees from the back at the center of the button hole. The worse you'll do is nick a replaceable reed switch and from that point a strong man(me) can grab a P2 or P3 by the lugs, and pressing the face of the watch against a solid surface, bend the lugs outward which will cause the back and ring to fall right out. Once the integrity of one side is gone, the cases aren't that strong.
These suggestions work, but are for most desperate cases(pun intended). I'd love to hear other options
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Sales of vintage LED, LCD, analog watches,
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