50 Dinara SOUR Nama, Zagreb

SOUR Nama was a large Zagreb-based department store chain operating under Yugoslavia's system of self-managing enterprises. Internal banknotes like this one — issued through an "interna banka" rather than the National Bank of Yugoslavia — were a product of the workers' self-management model, allowing enterprises to issue their own quasi-monetary instruments for internal settlements, bonuses, or employee purchasing schemes. These circulated exclusively within the enterprise's own commercial network.

Zavod za Izradu Novčanica, the official Yugoslav banknote printing works, produced this on filigree security paper with guilloche work — the same technical standards applied to state currency, which tells you these weren't informal vouchers.