50 Pfennig

Oldisleben is a small village on the Unstrut river in what was then the Prussian province of Saxony — not Thuringia in the strict administrative sense of 1921, though it sits in the cultural borderland. Like hundreds of German municipalities in 1920–21, Oldisleben issued its own emergency currency when the Reichsbank could not supply adequate small-denomination coin. Karl Naumburg in Kindelbrück was a local commercial printer, not a specialist banknote producer, which is exactly what you'd expect from a parish-level issuer stretching to cover tram fares and baker's change.