Dwudukat koronny - Jan II Kazimierz Waza Kraków mint

Jan II Kazimierz issued this coin during one of the most catastrophic decades in Polish history — the period Poles call the "Potop," or Deluge, when Swedish, Russian, Brandenburger, and Transylvanian forces simultaneously ravaged the Commonwealth. Royal finances were in ruins. The Kraków mint operated under severe constraint, and gold coinage from this period is scarce precisely because bullion was being consumed by war levies and ransom payments rather than coinage.

Kopicki 1906 is a recognized attribution, though die marriages for this type vary and close examination of the mintmaster's mark remains worthwhile for precise cataloging.