10 Kreuzers - Louis I

Hesse-Darmstadt's coinage underwent a forced rationalization in 1808 under French pressure, as Napoleon's reorganization of the Confederation of the Rhine pushed member states toward decimal-adjacent monetary systems. Louis I had only assumed the grand ducal title in 1806, when Napoleon elevated the landgraviate — his adoption of a modernized billon coinage that year was less a domestic reform than a political concession to Paris.

The .500 fineness reflects that transitional compromise: fine enough to circulate credibly, debased enough to stretch the silver supply during a period of continuous war requisitions.