Yes, they do look different, but you're saying the one I'm asking about is also authentic but an earlier version? Then I'll probably make an offer. Thank you Eva.
BxBoy, when I replied I was just assuming that the OP must be OK.It just doesn't look like the work of a forger. I don't think forgers would spend time trying to work out Peck's very strange looking autograph, especially given the modest prices they command. Here is one that sold at auction that is quite similar to the OP. It sold for £50.