Cutting cards from an uncut sheet????

[steve B]

I can think of instances where the manufacturer "reprinted" cards.
Or, made cards that were outside of general production, but were not readily identifiable as different.

When Topps had the "send us money and wrappers and a list of what cards you don't have and we'll send them to you" promotion.
They had so much demand for stars and rookies they printed special sheets to provide those cards. as far as I know the cards from those sheets are not identifiable unless you have an uncut strip or block.

Upper deck claimed a production figure for a hockey set, and later made more of them. Only found out because the first batch was packed on its own and the second batch was packed with other cards. (they also later faked yugioh cards which they were the licensed printer/distributor for. And apparently mostly got away with it. ) The "new" cards may be identifiable, I don't have enough from that set to know for sure.