10 Ducats - John III Sigismund

John Sigismund's multi-ducat issues from this period were struck in anticipation of, and then to celebrate, his acquisition of the Duchy of Prussia through the Treaty of Kruszwica in 1611 — a territorial gain that transformed Brandenburg from a middling German electorate into a power with Baltic ambitions. Large-denomination gold pieces of this kind functioned less as currency than as diplomatic instruments: presentation pieces handed to princes, envoys, and military commanders whose goodwill Brandenburg could not afford to lose.

Frappe quality varies considerably across the 1611–1614 window, likely reflecting interrupted production during John Sigismund's protracted negotiations over the Jülich-Cleves succession.