1 Fürstengroschen - Ernest I, Botho and Caspar Ulrich

Regenstein was among the smallest and most financially precarious counties in the Harz region, and by 1566 its ruling family was already deep into the territorial disputes and debt crises that would eventually cause the county to be absorbed by Brandenburg-Prussia in 1599. The joint issue under Ernest I, Botho, and Caspar Ulrich reflects the co-regency arrangement forced by the county's fragmented inheritance structure — a common legal necessity among minor German houses, but one that made coherent monetary policy nearly impossible.

The Fürstengroschen denomination itself was a product of the broader groschen inflation of the mid-sixteenth century German states.