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5th gen has the SKU # and the size. Custom have the size only.To add a little more info, the serial is printed on the inside of the left ear stem:
1st gen, serial starts with a letter then has 6 (I think) numbers, ex P123456
2nd gen, same as 1st with the letter "A" at the end. ex P123456A
3rd gen, same as 1st with the letter "B" at the end. ex P123456B, these are the last ones that are serialized
4th gen, does not have a serial number at all, inside left arm is blank.
5th gen, has the sizing numbers in the serial location.