Omega case numbers

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I can find serial number references but none on case numbers.
I am try to find what calibre fits a 166-020
and 166-016 case. I think they take two different size crystal, 31.6 and 29.6.
Thank you
 
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Search on the numbers either without the dash or with a dot instead ie 166020 or 166.020 I’ll leave some work for you but that one clearly uses cal 562. Sometimes multiple similar calibres were used in a given case number.