Poland
Krakow. Free City Pattern 3 Groszy 1835 MS63 Brown NGC, KM-Pn1. The Free City of Krakow ,created in 1815 by the Congress of Vienna, was granted the right to introduce its own currency, but it chose to enter the monetary union with the Kingdom of Poland and did not implement the right to introduce its own currency until 1835.
Estimate: 1000-1200 USD