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Advertisement for Elixir Grez Chlorhydropepsique. Card features a black and white illustration of a bronze key from the Carolingian dynasty, around the 8th to 10th century. The head is a large oval with crosses cut out of it. The blade is on the left, a square with an L-shape and a cross cut out of it to make the bits.
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The National Library of Medicine believes this item to be in the public domain. (More information)