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I haven't worked on that specific valve, but I've serviced several like it. If you undo the gland nut around the stem, you'll likely find a gland nut packing inside that stops leakage out the front (probably in the form of a graphite cylinder). There will also likely be a milled section in the shaft that directs the water flow from the tub to the shower, and it will probably have an o-ring on it. Just undo the gland nut and take the parts to the Mom and Pop shop; they'll probably identify it and set you up.
If no joy, post more photos here. Good luck.
BTW, don't un-sweat pipes. Just cut 'em and try Shark Bites if it gets to that point. Much less stress.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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