I've got these cut cards from the 1957 Topps set, that I believe are from one of the 3-card advertising panels. I find these interesting but have no knowledge about them. Is there anything in print, anywhere, that details advertising panels, or salesman samples? Anyone here have a good knowledge of them?
Things I would love to find out:
What, precisely, was their purpose?
Were they printed along with the production runs of the cards, on the same sheets?
Were they printed on separate sheets, prior to the production runs?
Are there any known, full, uncut advertising panel sheets known?
Like I said, I know absolutely nothing about them, other than they seem to be rather scarce and prices seem to be quite high on them.
