Paul. My understading is that R310's were issued in boxes of 50. They are the thin fragile 8x10 prints. The cardboard stock with red printing versions were ment to be displayed showing that along with your Buttetfinger you got whichever print was on top of the pile of 50.
Most of the cardboard stock versions that I have come across were St. Louis players. Players from other teams have been confirmed a number in the past 10 years. Over the past 40 so years when I have purchased original collections from the 1930's a number have had a few Butterfingers and at least twice I have had heard stories of how they were sold with Butterfingers directly from collectors. And at one point My Dad and I were very close to a complete set of R310's and had according to my old checklist 4 overprints.
But as I mentioned earlier there was extreme bad blood between Curtis candy and Babe Ruth so I cannot see them obtaining a license to offer a Ruth Premium.
As for your poster I downloaded this from the web site of the folks that offer these as fantasy items. If you enlarge you can see the same tabs as on your poster. Much easier to see on their site under stationary.
Hope this helps.
J
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