Variations
Some blank backs are proofs, and there can be a whole "set" of them, like the 1984 Topps Encased cards or the 1985 Topps Mini blank backs. Topps Vault sometimes sells blank back proofs from various years with a letter of authenticity .Those are usually pre production/distribution cards. If a blank back came out of a pack, I assume it was a printing error or mistake, much like the many wrong back cards that also show up. Sometimes they sell at a premium but in my experience the market is limited for them
If I understand the man made proposal, it would involve the manufacturer printing a card, realizing there was a mistake or error ( for example the 59 Spahn DOB), or that there had been an change in situation ( for example the 59 traded/optioned cards) and developed a 2nd printing of the card to correct the card or update it. In that case cards like the Herrer and Bakep and Campos would not seem to qualify. I assume it would, however, include the whole series of pose and print variations in the greenies 1962 series.
On your blank backs I would guess they would not qualify since it was a temporary printing defect that was not intentionally corrected. But I stand to be corrected. Another example of a whole set of print defects listed in the SCD Catalog are the 1982 ToppsBlackless cards .
Good issue for discussion
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