KPM/Berlin, around 1848. In the centre a polychrome painting with a large coat of arms. Monogram "GFC". The Thuringian principality of Schwarzburg-Rudolstadt (1697-1918) was a Prussian ally in the 19th cent. and joined the German Zollverein in 1835. Pfennig mark and red orb. Rim min. prof. rest. Diam. 23 cm.