Thanks for all the input. I think I'm going to pass if I can't get it off. I've waited a good few years to find this but I guess I'll have to keep looking.
It is a matte poster Archie so I had thought that would make it easier.
Regarding the autograph, I have no idea who's autographed it but I didn't think it was by anyone connected to the film. Even if the Director had autographed it I'd still want one without the scribble. Each to their own I guess. Still can't say I'm not disappointed but thanks for all the advice.