I think that we need better pictures to clear if it is a "Fake" but there are one or two things that tell that there is a big chance that it is a fake,lock pins position, no drop points. You don't mention the asking price and we not have proof mark pictures.It is also not a very early purdey (pin position) like there is now one on offer in the main Holt's sale lot Nr 1430, this is a very early and the pins are not in the same position as the Purdey's ne all know.
Marc.