100 000 000 000 Mark

Buer — now absorbed into Gelsenkirchen — was a coal-mining municipality in Westphalia, and like hundreds of German local authorities in late 1923, its treasury issued emergency paper as the Reichsbank's own notes became worthless faster than they could be printed. The hundred-billion Mark denomination places this squarely in the final weeks of the hyperinflation peak, when a single U.S. dollar was exchangeable for roughly four trillion Marks. Municipal Notgeld at this scale was not a novelty item — it was payroll.

Stadtkasse issues from smaller Ruhr cities are poorly documented, and survival rates vary sharply depending on whether local redemption drives were organized before the Rentenmark stabilization in November 1923.