Crystal reference, anyone?

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Does anyone know of like a online reference or PDF or something for a list of Crystal IDs by Omega serial number? I'm looking at the case label in the back and it says "3971-4SO" . It's a square model, and I can't seem to find it on cousins.co.uk. Thanks!
 
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Omega group their parts lists by watch reference number and unfortunately the only ones I have found don't list a crystal.
I doubt that Omega would still be able to supply an original but you could always enquire at an Omega store.

You can also try using either Sternkruez or GS catalogs to track down a generic crystal after removing and measuring your original crystal.
 
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Just found these Omega plexi.
Might be correct? Although no reference number.
 
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Omega no longer has crystals for this case.