Quote:
Originally Posted by sflayank
Best guess is the card was chemically treated to remove
Stains and it worked too well
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That was how the card was originally printed. Al owns a 1958 #135 Moe Drabowsky that has a similar missing print defect on the back, and there is a 1958 #142 Enos Slaughter on eBay that is missing a large area on the back. The 1958 Mantle is #150, so I think it's safe to say that they were all on the same sheet.