Steve it's an interesting question. I don't think the way the set was produced that it would be probable for a scrap card to show up with a "wrong back." For example a Walter Johnson portrait with a Uzit back.
Each print group was printed for a period of time and during that time a group of back advertisements were applied to them. Once that print groups production was completed the subjects were discontinued and the next one began. When the use of one print group stopped and the next began is when new back advertisements were introduced. So I don't believe the opportunity to print a "wrong back" would be there. Discontinued subjects would not be available to be printed with new back advertisements. Or old back advertisements wouldn't be available to be printed on new subjects.
It's plausible that these "wrong backs" could have been printed at the time the transition from one print group to the next happened. If blank back sheets of discontinued subjects were used for testing purposes for example. This would be similar to how brown Old Mills came to be.
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