Omega crystal for 166.070

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Hi! I found the pz5005 to be the correct crystal for the 166.070 Geneve, I bought one on eBay and it is 31.7mm diameter, my watchmaker told me that is not the correct diameter because the case is 31.2 wide, so what's the problem? is the pz5005 the correct crystal for the 166.070? which diameter should it be? Thanks a lot 😟👍
 
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Correct crystal for that case number is the one you have...

063PZ5005 | GLASS PLEXI ST RING D31.62 H4.6

So either you don't actually have a 166.070, or you may need to find another watchmaker.
 
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Oh.. ok ahahaha, that's the case, is it not a 166.070?