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CSG flip with '52 Topps Mantle Type 1 vs Type 2: crossover graded "8"
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10-20-2022, 10:05 AM
steve B
Steve Birmingham
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Join Date: Sep 2009
Location: eastern Mass.
Posts: 8,162
So, what is the earliest reference to the two types?
The oldest I can think of was Ralph Nozakis book in I think 1975.
So it was known then, but how much before then?
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