Agree that it is almost impossible to distinguish between most blank back proof cards and blank back mistakes in production, unless it comes from Topps Vault or the front differs in some way from the issued cards, as is the case with the 84 Encased cards, the 3 1960 proofs of Cimoli, Throneberry and Hadley, the 67 Maris Yankee ( which may have been a "produced" proof) and the dozen or so 77 proofs listed by SCD, which includes the R Jackson Oriole.
But in some cases a blank back proof may show a different colored stock than an issued card
Last edited by ALR-bishop; 01-21-2021 at 01:31 PM.
|