Visit any brick-and-mortar business that has a service counter and you will likely see a small plastic or wood easel holding a stack of business cards. I have also seen this type of easel used in restaurants, museums and offices holding up some kind of fixed message card.The upper photo shows a business card (87mm X 50mm) on the easel to get an idea of size. The easel itself is 47mm X 40mm (W X H) and leans back at something like 17 degrees.This easel will hold a dozen flat business cards and there is a 0.7mm lip on the leading edge of the easel's ledge to help hold the cards in place.
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Imported from Thingiverse: https://www.thingiverse.com/thing:3552
Original creator: ElectronicKit