⅔ Thaler - Maximilian Frederick of Königseck

Maximilian Frederick of Königsegg-Rothenfels was simultaneously Prince-Bishop of Münster and Archbishop-Elector of Cologne from 1762 until his death in 1784 — a dual appointment of considerable political weight in the fragmented ecclesiastical geography of the Holy Roman Empire. The ⅔ Thaler denomination, equivalent to the Gulden or Florin, dominated trade across northwest Germany during this period precisely because it aligned with the Leipzig monetary convention of 1690, which the region's merchants had never fully abandoned.

Münster's output under Maximilian Frederick was modest and his coinage relatively short-lived as a circulating series.