More than likely...that Greener would have left the shop with a checkered rear end. If the pad is a high quality pad like a Silvers, Pachmayr "old english", etc, and properly installed, I see no reason that should detract from the value. Noticed I said "properly" installed.
The FH25 is a sweet gun, the facile princeps is arguably the nicest boxlock action to come out of Britain, certainly one of the most attractive. When I had mine FH25 restocked, the stocker called to tell me how impressed he was with the "guts" of the gun, every single part was polished like the insides of a best gun. Greener took pride in building every gun that left the factory and its these "little" details that set Greeners apart from many other makers.
Many quality woodsmiths out there who can fix the crack, check or whatever it is.
How much is the FH25 you are looking at buying? What gauge is it?
My go to bird gun


The receiver shape....very attractive

