500 000 Mark Bergwerksgesellschaft Hibernia

Hibernia was one of the Ruhr's dominant coal-mining companies, and like hundreds of German industrial firms during the hyperinflation of 1923, it issued its own emergency currency — Notgeld — to meet payroll when Reichsbank notes simply couldn't keep pace with collapsing purchasing power. The 500,000 Mark denomination places this squarely in the middle period of the crisis, before the truly astronomical figures of late 1923 rendered even million-mark notes functionally worthless within days of issue.

Industrial Notgeld of this type was printed locally and quickly, often on whatever stock was available. Hibernia's notes were redeemable against the company's own accounts, making their acceptance essentially a matter of employer trust.