50 Pfennig

Oldisleben is a small town on the Unstrut river in what was then the Prussian province of Saxony — administratively distinct from Thuringia proper, though the region is often grouped with it in notgeld references. This note is one of thousands of municipal emergency issues printed between 1920 and 1922 to relieve the chronic small-change shortage that followed Germany's postwar economic dislocation. Karl Naumburg in nearby Kindelbrück was a local commercial printer, not a specialist currency house, which is exactly the sort of operation municipalities of this size had to rely on.

The reference suffix "1a-4/10" suggests a dated series variant — worth cross-checking against other known Oldisleben pieces before attributing condition-related scarcity to rarity.