50 Pfennig - Bielefeld Stadtsparkasse

Bielefeld holds a peculiar place in German notgeld history — the city's institutions issued emergency coinage so prolifically during and after WWI that "Bielefeld porcelain money" became internationally famous. This zinc piece predates that curiosity, issued by the Stadtsparkasse in 1917 when the wartime metal requisitions had stripped copper and nickel from civilian coinage entirely. The Reichsbank's suspension of small-denomination production that year forced savings banks, municipalities, and even private firms to fill the gap themselves.

Zinc was the compromise material: abundant, undesirable to hoarders, and cooperative enough to strike. It corrodes readily in humid conditions, which explains why undamaged survivors are genuinely uncommon despite substantial original mintages.