1/2 Thaler - John Casimir and John Ernest

Saxe-Coburg-Eisenach existed as a joint duchy only between 1596 and 1633, when brothers John Casimir and John Ernest ruled together under the terms of their father's inheritance arrangement. The brevity of that co-rulership window makes the entire coinage of this period inherently short-lived, and pieces dated to the early years of the joint reign — before the brothers' relationship soured into open territorial dispute — are correspondingly scarce.

The Grasser reference places this among a small documented series. Four years of production under two signatures was never going to yield large mintages.