Universal Geneve Polerouter 215-9 - searching for appropriate crown

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Case reference and case serial numbers are usually found together on the outside of the case back. One needs to be careful, as they were not always deeply engraved and can be inadvertently removed by too much polishing.

gatorcpa
 
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If you can't find the reference number:
There are not too many 218-9 listed in the reference list (assuming it is the original movement), is the case 33,5 mm or 35,5 mm?
 
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Case reference and case serial numbers are usually found together on the outside of the case back. One needs to be careful, as they were not always deeply engraved and can be inadvertently removed by too much polishing.

gatorcpa
Anywhere else they might be located? Nothing on caseback.
 
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If you can't find the reference number:
There are not too many 218-9 listed in the reference list (assuming it is the original movement), is the case 33,5 mm or 35,5 mm?
It's a 215-9. 33.5
 
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Saw your correction as I was replying. I am having an impossible time locating the ref or serial number on mine. There is nothing on the caseback. Do you have a photo of the crown on that one you posted? (I am almost certain the movement was not swapped in mine.)
 
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Saw your correction as I was replying. I am having an impossible time locating the ref or serial number on mine. There is nothing on the caseback. Do you have a photo of the crown on that one you posted? (I am almost certain the movement was not swapped in mine.)
They are often polished away. As @Passover has already done, you should still be able to figure out the reference based on using the above website (case size, material, dial type, movement, etc)

you would probably have better luck reaching out directly to @CafeRacer (or hamblar on IG) and asking for the crown specs for a 20368