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Crystal Questions


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Okay all! 

I feel like a taker and never a contributor on here since I don't have a great deal of knowledge to share. That said I am eternally grateful for all you that do and often share! (and I guess those of us that aren't contributing all the time are providing some service to learning)

Back to my question! I have an old Elgin Square gent's watch -movement from 1938 and need a crystal. My measurements from inside the bezel are 19.5 x 19.5. The only crystals I can find are CS 400 and CS 405 400 being 19.4 x 19.4 and 405 being 19.7 x 19.7 so my guess is the smaller of the two? Giving I am finding the correct crystal. this is the first time trying to purchase a crystal.

Thoughts or advice?

 

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