Paper stock. If you're familiar with the Sporting News or Baseball Magazine premiums, I'd say the Metropolitan issue is comparable in this regard.
Depending on how open-minded you wish to be, they could be considered a premium, a "card" or a 7X9 photo. It's a very interesting regional issue.
Last edited by BillyCoxDodgers3B; 02-06-2021 at 10:19 PM.
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