I wish that I knew more about this item and its history.
On its face it states that it is a “Pick A Card Jackpot” board. Stapled to the thick fibreboard type material are 52 playing cards. They are Caesar’s Palace cards and glued on top of each is a smaller sized card with a famous pin-up back – Joyce Ballantyne’s “Cowgirl” image. This design had been made into a deck of cards in 1947, one deck of a famous double deck of Ballantyne cards. But this is not simply that Ballantyne deck. Although it is the Ballantyne design, it is a set of cards specially made with that back. These special Ballantyne cards are glued “on top of” a standard casino-type Las Vegas “Caesar’s Palace” card. While the Ballantyne “Cowgirl” deck dates to 1947, Caesar’s Palace in Las Vegas did not open until 1966; this suggests that the board does not date earlier than 1966.
I don’t know how common these “Pick A Card Jackpot” boards were in the casinos of Las Vegas in the 1960s. I also do not know whether the boards were “reusable.” If so, this board may have a history pre-dating Caesar’s Palace. The board itself makes no mention of Caesar's Palace. I tend to think that the board was reusable because the cards on the board are mint, but the board itself has wear. In its present form/condition the board is complete. All 52 cards are still on the board. As noted, the cards are “as new,” but the board has wear and is slightly warped (i.e., does not lie completely flat).
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