If there are plenty of them, I'd recommend dissecting one to see how
well they're made, and what sort of components are inside. If the
crystal is hermetically sealed, it's probably OK. If there are any
aluminum electrolytic caps in there, they may be no good. Most other
parts from that era should be OK.
If possible, you should pretest a bunch of them to see if they seem
up to snuff.
Ed
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