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For coin watches in general and specifically for Cartier coin watches, this example appears to be noticeably earlier than one would expect. Firmly dating to the 1930s, we link see the proliferation of coin watches more towards the 1950s from brands like Patek, link Rolex, Vacheron, Piaget, and more. A hint that this Cartier is slightly earlier is the opening mechanism in which a small section of the coin edge functions like a clasp. Later, opening button mechanisms were link built into the edge.