1/2 Conventionsthaler - Charles August

Bretzenheim was a tiny Rhenish county whose ruling line had acquired the title through dubious Napoleonic-era maneuvering — but this coin predates that, struck in 1790 when Karl August von Bretzenheim was still navigating his legitimacy as an illegitimate son of Charles Theodore, Elector Palatine. The county itself had fewer than a thousand inhabitants. The ambition of striking a half-Conventionsthaler in that setting says more about dynastic posturing than any economic necessity.

KM#3 implies a minuscule series. Surviving examples are genuinely rare in any condition.