Sorry to revive an old thread, but I was thinking the same thing about the same thing about my Big Pilot. As far as I can tell, the sunken crown on the rep seems to be the easiest tell on an otherwise magnificent piece.
I read in another thread that the Gen crown and tube does not fit into the ZF Factory rep case and that a mod is needed. Is it a difficult mod to make? Was also thinking of getting a Gen crown to put into my piece.