Duit Brockage error

Brockage errors occur when a freshly struck coin adheres to the upper die and becomes the effective die for the next blank fed into the press — producing an incuse, mirror-image impression on one face. For Zeeland duits, where the copper planchets were often poorly prepared and the striking pressure inconsistent, the conditions for this kind of mis-strike were more favorable than in higher-denomination production.

Zeeland duits were among the most widely circulated small coppers in the Dutch colonial trade network, turning up in VOC settlement sites from Batavia to the Cape. A brockage from this issue is a production accident that survived disposal — worn or defective pieces were routinely melted and re-struck.