Mint, sealed deck of railroad playing cards, made by Brown & Bigelow c.1950 for Denver & Rio Grande Western Railroad. It is shown in Bollhagen as DRGW-7 (“Engine 5464-Left”).
I believe that the deck has 52 cards, including a special Ace of Spades, plus 2 Jokers. The cards are bridge size, and come in the original box.
As noted, the cards are mint and still sealed in the box by the tax stamp; the cellophane is no longer covering the box, but it is sealed and has never been opened.
Reference: Bollhagen, The Great Book of Railroad Playing Cards, p.62, DRGW-7.
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