Pete
I did a lot of research on these 12 players a few years ago. If you search the archives for a thread I started named "A possible T206 sheet", I talked about how these 12 player's cards consistently show a wet sheet transfer on the front of their cards. I believe it occurred during production and I also believe these 12 players were on a sheet together.
I also own a few of these 12 player's card with Sweet Caporal 460-42 backs and all of mine have the same wet sheet transfer. I've seen too many over the years to think it happened from storage. This wet sheet transfer would have occurred on other cards and not just the factory 42s if that was the case/cause. I've never seen a McGraw SC factory 30 with this wet sheet transfer, yet almost all of his SC factory 42 cards have it. A few factory 42s do appear without the wet sheet transfer and this was probably because of the way the sheets were stacked. No transfer means that card was either on the bottom or top sheet depending on how the sheets were stacked during production.
Jantz
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