Casimir IV Jagiellon Ducat

The Casimir IV Jagiellon ducat is remarkable for its high gold purity, often exceeding 98 percent, which made it a trusted medium in international trade during a period of rampant debasement elsewhere in Europe.

That purity didn't come cheap. Minted in cities like Krakow, these coins bore the king's bust on one side and the Polish eagle on the other, symbols that asserted royal authority amid the era's political flux. Weighing around 3.5 grams, they were small but potent, circulating from the Baltic to the Black Sea.

Records of exact mintage figures are murky; most were likely destroyed in later conflicts. Still, surviving examples show fine craftsmanship, with dies that sometimes varied by region, reflecting Poland's decentralized minting practices.

One oddity: these ducats occasionally turn up in hoards with Venetian counterparts, as if they were trying to blend in at the family reunion.