Generic USPC, likely wide sized and jumbo index, 1930s-50s. Came in two-piece, gold letter embossed, cardboard slipcase. It is one of the generic USPC backs, and the ace may even be Bicycle style. But it is not necessarily branded as a Bike per se. I have not seen a specific name for this back in the past. Decks were sold in single and double packs, red and blue. Glassine paper and gold seal puts deck earlier than later in time range. These are fairly common to find still, today.