Acquaintance Cards
Definition from the Encyclopedia of Ephemera (Routledge, 2000), p 4:
"A novelty variant of the American calling card of the 1870s and 1880s, the acquaintance card was used by the less formal male in approaches to the less formal female. Given also as an 'escort card' or 'invitation card,' the device commonly carried a brief message and a simple illustration.... Flirtatious and fun, the acquaintance card brought levity to what otherwise might have seemed a more formal proposal. A common means of introduction, it was never taken too seriously."
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