Honestly even a pam owner wouldn't be able to tell unless he's a hardcore fan. I mean super hardcore. Did I say hardcore?
I owned 8 genuine pams the past 10 years from luminor to marina, from hand wound to auto. I thought I knew a lot about pam, until I saw an ultimate rep the first time in my life. I couldn't tell the difference at all.
Btw I learned more in this forum than any gen forum where all they do most of the time is showing off their new purchases.