Nice discussion, LK.
Here's a question, for the sake of argument: Say I have a gen vintage watch and it's missing the pearl. So I find a nice aftermarket pearl, vintagize it, and glue it on.
Is my watch still a gen?
Now let's say my insert with the new pearl is really nasty. So I find a good PMWF insert, age it slightly, glue in that custom aftermarket pearl, and snap it on.
Is my watch still a gen?
Now, I'm tired of the boring caseback, so I go looking and shazzam, there's a gorgeous COMEX caseback for sale. I snatch it and put it on my watch.
Is my watch still a gen?
I'm sure you see where I'm going with this. At what point does it stop being gen and start being fake?
Is a '66 GT Mustang without the Hipo small block still a GT?