1 Silver Ducat Brockage error

Zeeland's silver ducats of this period were struck at the Middelburg mint, one of the seven provincial mints operating under the decentralized monetary system of the Dutch Republic — each province jealously guarding its minting rights despite repeated calls for consolidation. A brockage occurs when a freshly struck coin adheres to the die and becomes itself a die for the next blank fed into the press, producing an incuse mirror image on one face. The result is a minting error, not a post-mint alteration, and it requires a failure of the ejection mechanism to have gone undetected through at least one full striking cycle.

Zeeland ducats are not rare in themselves, but documented brockage errors on provincial Dutch silver of this denomination are genuinely uncommon in the literature.