Germany
Weimar Republic Mint Error 50 Rentenpfennig ND (1923-24) MS65 NGC, Karlsruhe mint, KM34. An incredibly striking error (pun intended), showcasing four distinct impressions, with each one displaying the "G" mintmark of the design. Wonderfully preserved as well, and one of the more dramatic errors that we've seen on 20th century German coinage.
Estimate: 500-700 USD