5 Pfennigs Rüberg's Liköre

Stamp money — Briefmarkengeld — emerged across Germany during the acute small-change shortage of 1916–1922, when metal was consumed by the war effort and postwar instability drained coins from circulation. Encapsulating a postage stamp in celluloid and printing a merchant's advertisement on the reverse was a cheap, legally tolerated workaround. A. Zölzer used the format to double the function: emergency scrip and liquor store publicity simultaneously.

Rüberg's Liköre was a regional spirits brand out of Elberfeld, then a major industrial city in the Wupper valley before its administrative merger into Wuppertal in 1929.