20 Mark Saarlouis; PoW Camp

Offizier-Gefangenenlager Saarlouis was a camp specifically for captured officers, which under the 1907 Hague Conventions entitled prisoners to receive pay in proportion to their rank — the Germans were obliged to honor this, and internal camp currency was one mechanism for managing it without introducing Reichsmark notes into prisoner hands. The 20 Mark denomination is on the higher end for Lagergeld of this type, consistent with officer-grade purchasing power within the camp canteen system.

Saarlouis camp issues are not common on the market. Documentation on the full series remains incomplete in most major references.