Watch List notes:

Germany, Prussia, Wilhelm I, 20 Mark 1872 C, Frankfurt
Niemcy, Prusy, Wilhelm I, 20 marek 1878 C, Frankfurt

Gold 7,95 g.

Złoto 7,95 g.

Germany

Grade: XF-
Diameter: 22.50 mm
Literature: Friedberg 3818, Jeager 246C

More photos and full item description available on auction site here