First day cover postmarked in Bonn. The 2022 stamp sheet commemorates a very famous and rare stamp error from 1851. The first postage stamps issued by the German state of Baden on 1 May 1851 included a 9 kreuzer green stamp that was supposed to be printed on pink paper. The green was meant to be used for 6 kreuzer stamps. There are only five known examples in existence. Only one copy is unused and was last sold at auction for over €1.3 million.
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