For the T207's, I doubt it was a salesman unable to find a sponsor. These sets were done in concert with the ATC, with the lithographers apparently calling the shots and picking the advertising as effectively an outsourced marketing department (they don't only do the design, they even name the brands for the ATC). I think what we have found suggests there wasn't really a salesman in this sense of the word in this process. Those paid sales commission don't seem to have sold the cards to the ATC like this, but selected what to make for them and operated more as what we would call a program manager today rather than a real salesman shopping around wares.
The anonymous caramels I would assume were sold more in a conventional way, to outside customers.
I don't know why T29 and T207 have anonymous factories versions, I would suspect they were used as filler for last minute brand changes or new brands that hadn't been named or had their marketing aesthetic chosen yet, but that is purely a guess.
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