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runscottBefore you ever get into a new vintage issue, first buy a few beat up commons and examine them closely with a 10x to get a feel for print technique, thickness, etc. (even smell...Leon). or maybe even taste: my dog refuses to lick reprints. Also, buy a nice reprint set - you can always dump it on ebay later or sell to AJSPORTSCARDS (you too can be a huge estate seller!).
After doing the above, reprints should be very easy to spot, forgeries also but a little bit more difficult than reprints. On Goudeys, you can also look for the layering in the cardboard on the edges. You will then have the confidence to spend money you don't have.
I wish I could say that I find restoration and trimming easy to spot, but I don't.