3 Ducats

Regensburg occupied a peculiar constitutional position within the Holy Roman Empire: it was simultaneously a Free Imperial City and the permanent seat of the Reichstag after 1663, meaning the imperial diet never left. That political permanence gave the city's mint unusual institutional continuity, and multi-ducat issues like this one were struck not for everyday commerce but for presentation and diplomatic use — passed between delegates and officials who congregated there in numbers found nowhere else in the Empire.

The .986 fineness follows the established ducat standard, traceable to the 1559 imperial coinage ordinance. That the city maintained this standard through the turbulent final decades of the Empire's existence is itself notable.