⅔ Thaler - Christof Frederick and Jost Christian

The 2/3 Thaler denomination — effectively a Gulden by another name — was the workhorse of north German silver coinage through much of the eighteenth century, and the small County of Stolberg-Stolberg used it aggressively to assert its minting rights under the Holy Roman Empire. The joint-reign issues of Christof Frederick and Jost Christian reflect the county's practice of co-rulership under the agnatic succession rules of the house, a arrangement that produced a relatively compressed series of shared-authority types before the line divided again.

The Müseler reference places this squarely within the Harz mining region's documented output. Stolberg's silver supply drew directly from local Harz extraction.