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 On display at the CRMI  | |||
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 Wayne, that's a toughy. Frank | |||
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| IHC Member 456 | 
 I'm pretty sure that it's a wristwatch case back opener/closer. Mike | |||
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| IHC Member 456 | 
 It's a Williams Universal spanner wrench for opening and closing case backs.  The patent number is 2418999.  You can look up the patent at the uspto.gov website | |||
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