1957 Topps - What would be considered a "low pop?"

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Posted By: Bob

I wouldn't get too attached to trying to come up with a rule of thumb for low pops. Some cards are legitimately hard to find in a certain grade based on centering issues, registration, print dots, etc. Others are hard to find because demand exceeds supply (i.e., a large enough number haven't been submitted yet). Learning to differentiate between the two categories is crucial if you're going to compete for lower population cards.