20 Zlotys Mikołaj Kopernik - ECU

Issued the same year Poland formally applied for European Union membership, this coin's ECU denomination was a calculated diplomatic signal — the ECU being the EU's precursor accounting currency, never issued as circulating coinage by any member or candidate state. Poland adopted it here purely as a gesture of Western alignment, a common tactic among Central European nations maneuvering toward Brussels in the mid-1990s.

Kopernik's selection was not incidental. He had appeared on Polish currency repeatedly since the communist period, but pairing him with a European denomination reframed him as a continental intellectual rather than a national symbol.