1 Ducat - Christina

Erfurt spent much of the Thirty Years' War under Swedish occupation, and Christina — then a minor ruling under regents — was the nominal authority whose name appeared on the city's coinage. The 1644–1645 dating places this ducat in the war's final phase, just before the Peace of Westphalia ended hostilities in 1648. Erfurt had been a Swedish administrative center since 1631, and its mint operated under that arrangement throughout.

Ahlström's cataloguing of Swedish-related German issues remains the standard reference for this type, and the KM#85 attribution confirms the narrow window of production.