Conrad Balmberger Münz-Prägeanstalt Vereinsabzeichenfabrik, Nuremberg, Germany (1871-1972) Ludwig Christian Lauer,Nuremberg, Germany (1729-1924)
Mintage
ND - F#520.6, Ø 20.0 mm or 20.5 to 20.7 mm - ND - F#520.6a) Ø 20.5 to 20.7 mm. Reverse: denomination 6.5 mm high, serif of `1` thin - ND - F#520.6b) like a), serif of `1` short and cut off, gap between `K` and star 3.0 mm - ND - F#520.6c) like b), gap between `K` and star 3.5 mm - ND - F#520.6d) Ø20.0 mm, Reverse: denomination 7.5 mm high -