1912 1913 ( commemorative ) Appearance Mass 11.111 g [1] Diameter 28 mm [1] Thickness 2 mm [1] Obverse Click to William I (1876-1884) [2] Frederick III (1888) [3] Wilhelm II (1888, 1891-1912, 1913 commemorative Wilhelm) [4] [5] Frederick I , Wilhelm II (1901 commemorative) [6] Eagle holding snake , state title,