1c Black on Salmon Pink, Postal Card, Error of Card Stock Color (UX9d; USPCC unlisted). Mint card, the USPCC does not recognize these as error cards even though the printing of the design is 100% genuine, it seems the salmon pink stock was used as a counting marker for counting finished piles of 500 printed sheets, obviously some found their way into the hands of collectors, rare and attractive variety, footnoted in 2010 USPCC on p. 9

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