1 Ducat - Charles X Gustav

Charles X Gustav launched his Pomeranian campaign in the mid-1650s as part of the broader Second Northern War, a conflict that pulled Sweden into simultaneous engagements against Poland, Denmark, Brandenburg, and the Habsburg Empire at once. By 1659, the year of this strike, Swedish forces were under serious pressure — Denmark had re-entered the war and Swedish-held Pomerania was increasingly isolated. Ducats of this type were almost certainly minted as campaign financing rather than general circulation.

Charles X Gustav died in February 1660, weeks before the Treaty of Oliva ended the war. He never saw the peace his treasury helped purchase.