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One major difference which will make identifying major difference between Topps and O-Pee-Chee unmistakable may be the language within back within the card. The informative blurb on Topps cards will only be in English whereas OPC is within English and French. Interestingly, on the O-Pee-Chee cards, at times the information was different in English that is was in French. I spent last winter in Mexico. I left any where I talked like a two year old, nouns and verbs in present tense, in order to some place where I had even less knowledge on the words vocal.