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Others may have a better answer, but I believe that the SKX crystal is 31.5mm and the 150m 7002 crystal is 32mm in diameter. The 200m 7002 crystal is either 31 or 31.5mm (I can't remember which).

All that said, I believe that a sapphire crystal from a 6309 would fit a 150m 7002 case perfectly. I haven't done that personally, so hopefully others can chime in with examples.
 

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The buyers guide is in error - the late 7002 crystal is 31.5mm -same as SKX 0020 case. The early 7002 uses a 32mm crystal -same diameter but different thickness as a 6309.
 

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Thanks for the correction. I just double checked on my end and sure enough the measurement is 31.5mm. The guide has been updated and is now correct on this point.
 
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