25 Schilling Auer von Welsbach

Carl Auer von Welsbach was one of the most commercially consequential chemists of the 19th century — inventor of the gas mantle, the flint lighter, and the isolation of several rare earth elements — yet this 1958 issue marking the centenary of his birth was part of Austria's postwar silver commemorative program that drew little international attention at the time. The series was aimed squarely at a domestic collecting market still rebuilding after occupation.

The .800 silver alloy was a deliberate cost compromise, chosen as Austria worked to reestablish its mint operations under the Second Republic.