1919 - F#508.3, also nickel or brass plated - 620 100 1919 - F#508.3a) surface with nature or nickel colour ; Obverse: rim ⌀ is 18.0 mm (inner side measured) - 1919 - F#508.3b) like a) but surface is brass plated - 1919 - F#508.3c) surface with nature or nickel colour ; Obverse: rim ⌀ is 18.25 mm (inner side measured) - 1919 - F#508.3d) like c) but surface is brass plated -