1 Thaler - John Casimir and John Ernest II

Saxe-Coburg-Eisenach was itself a product of the relentless Ernestine Saxon habit of subdividing inheritances, carved out in 1596 when the duchy of Saxe-Coburg was partitioned yet again. John Casimir and John Ernest II ruled jointly — a co-regency that was less a political choice than an obligation under the house's inheritance customs, which resisted outright partition while refusing to grant sole authority to either brother. Joint-reign thalers of this type name both dukes on a single coin, a necessity that complicated die production and explains the multiple obverse varieties Grasser documents for this short series.

The reign ended with John Casimir's death in 1633, but this issue ceased well before that — production stopped around 1619, likely tied to the financial disruptions preceding the Thirty Years' War.