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PaulRhys, you may be confusing these with the orange border manager cards from the 1930s. Those were confirmed to be cut outs from a calendar.
Steve, mine have no text on the back. I saw the text in Draper Maynard's scan and was wondering about that. Because my Mel Ott is torn so badly, I can get a clear look at the structure of the stock. The bottom layer is white, the middle layer is cardboard color. The top layer is a bit tougher to judge, but I think it is also white. If I had to guess as to a "non-card" theory, my guess would be that these were cut from the cover of a board game.