Commemorative coins of Poland
Commemorative coins in Poland are special coins minted by the Polish Mint and issued by the National Bank of Poland (the only issuer of the Polish coins ). Each year several collector and commemorative coins are minted to mark political, historical, scientific, cultural, sporting, humanitarian and other similar events of general importance to Poland or with wider international significance.
Source: Wikipedia — Commemorative coins of Poland (CC BY-SA 4.0)