72 Topps Proofs
Good question. There are several types of proofs. The most appealing to me are the Proofs that show the card in its final form. I am not an expert by any means but my proofs may use different inks or have different card stock which is evident when you look at the reverse. In other years the cardstock was slightly different in color or texture.
For the card mentioned above it was originally bought at the 1989 Topps Vault Auction and seller indicated it was a proof. For all intents and purposes it looks like the final card. There really isn't a way to tell if it us a printer error of a proof....other than it is a well centered card.
Z Wheat
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