UNC is just an abbeviation for uncataloged. It's used in other hobbies too, especially stamps.
I'm not sure how something would be "officially" UNC. And it varies with what catalog you use. (And what you consider cataloged)
ACC didn't have checklists, so until the sports collectors bible came out UNC would have been an entirely new set.
Sports collectors bible had checklists, so you could figure out previously unlisted players.
The early Becketts helped a bit with better checklists on some stuff, and pictures. But far fewer checklists.
SCD took it a whole lot farther, probably as far as they could with a space constraint.
I don't have it, but the old Judge book probably goes farther while focusing on one set.
There's room for a whole lot more, As there is a load of detailed information that hasn't made it into a formal catalog. The superset spreadsheet, and the confirmed lists for T206 come to mind, T205 needs something similar.
And all the lists that made up the earlier books were probably published before either in a book I don't know about, or in one of the early hobby publications. I know the first place I saw many checklists was the Trader speaks.
Steve B
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