I would, instead, check how many copies were made of the print. E. g. if the print says 15/450 or something like that, then it's print #15 out of a lot of 450 - and a lot less likely to be a real signature.
I am not an expert in this field and am mainly bumping your topic, but I am looking at this from a pragmatic perspective. Signing 450 copies of something is painful although not impossible. And of course a few copies could be signed here and there, or at shows, etc. An antiques dealer in your town is probably a better source of information on such things.