On e-bay (not sure if they're still available), this one seller used to offer gen crowns for historic Luminor Pams, meaning 44mm pams with crown guards for about 99 dollars. I am not sure if you can purchase one for 183 (I am also guessing that it probably won't be easy to fit it).
Based on my understanding, crown is not really an issue in terms of visual (rep vs gen), or what is causing the strip problem (it's the crown tube threads stripping).
i had my gen apart last week to clean it.. the stem and crown is integrated into one unit. not like the reps use seperate stem and crown. adam co on ebay may have it but i doubt it. the gen assembly is just so nice to screw down. butter smooth
if yours is just stripped davidsen has the tube/crown assemblys and they fit every one i replaced without trouble. i have a bunch of them here. comes in handy.