⅔ Thaler - Charles I

Brunswick-Wolfenbüttel's two-thirds thaler denomination existed because of a monetary disaster: the Zinna convention of 1667 and its successor agreements never fully resolved the fragmentation of German minting standards, leaving north German states issuing coins calibrated to the Leipzig foot rather than the later Prussian conventions. The two-thirds thaler — valued at 16 groschen — became the practical workhorse denomination across the Lower Saxon Circle precisely because it bridged incompatible accounting systems.

Charles I's reign saw Brunswick deeply entangled in the Seven Years' War, with Wolfenbüttel territory occupied by French forces between 1757 and 1762. The long emission span of this type, stretching across fifteen years of post-war recovery, reflects chronic pressure on silver supplies throughout the 1760s and 1770s.