Principality of Schwarzburg-Sondershausen in 1896 , during the reign of Prince Charles Gonthier . A commemorative coin was subsequently issued in 1905 to mark the Silver Jubilee (25th anniversary) of Gonthier's reign. [5] History Edit The commemorative 1905 coin. Added by Dser The first Schwarzburg-Sonderhausen 2 mark coin was issued in 1896.