Poland
Alexander I of Russia 10 Zlotych 1820-IB, Bit-819, Uzd-4496, KM-C101.1, VF/XF, cleaned, with minimal corrosion. Mintage of just 543 pieces. This coin, both as a date and a type is missing from many collections. Alexander became king of Poland after the Napoleonic Wars, but he did little to improve the country.
Estimate: 2500-3000 USD