0,5 German Mark Vrbas, Jajce

OOUR — Osnovna Organizacija Udruženog Rada, or Basic Organization of Associated Labor — was the fundamental economic unit of Yugoslav self-management socialism. These fractional-denomination necessity notes were issued by individual enterprises when small-denomination federal coinage became scarce or impractical for wage and canteen transactions, a recurring problem in Yugoslav industrial towns through the 1970s and 1980s. Vrbas Jajce was a wood-processing combine in central Bosnia, and its scrip circulated internally, redeemable only within the enterprise's own network.

The control stamp is the only anti-counterfeiting measure — appropriate given the purely local scope of acceptance.