I've found pictures of the PAM253 which I will post later tonight, but it appears that the one on the Panerai website is a prototype, and that was the one repped.
The problems I see are the tick marks on the outside, which on the genuine is on a smooth track on top of the hobnail dial. The pictures will explain everything. (Finally signed up to photobucket!)
Also, there are a few tick marks between each big one, while the one on the Panerai website has one small one, one big one, one small etc like the PAM212s that we've seen.
Any thoughts from anyone else?
Now I'm thinking maybe the PAM253 is not as accurate as I once thought. Of course both 212 and 253 rep have no flyback functionality.