The Baden 9 Kreuzer Error was a postage stamp error produced by the historical German state of Baden in 1851.
On May 1 of that year, Baden's first postage stamps were issued. The "9 Kreuzer Green" stamp was a color misprint of the 9 Kreuzer denomination that was printed in green instead of pink. The green color was intended for the 6 Kreuzer value, but apparently the paper sheets were mismatched. Only three cancelled copies and one unused copy of this error are known, but more sheets of paper may have been printed. The cancellations recorded have the numbers "4" for Achern, "41" for Ettenheim, and "106" for Orschweier (today Mahlberg). Two of the known copies are on letters.
Read more about Baden 9 Kreuzer Error: Four Copies
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