50 Dinara Munja, Zagreb

Munja ("Lightning") was an electrical goods manufacturer based in Zagreb, and like many Yugoslav industrial enterprises during the post-World War II period, it issued internal factory notes — notgeld-style scrip used within the company's own ecosystem, most likely redeemable at a factory canteen or workers' cooperative store rather than in open commerce. These pieces occupy an odd taxonomic space: neither banknote nor bond, they're catalogued by notaphilists largely because no better category exists.

Documentation on the full Munja scrip series is sparse. Dates of issue and precise redemption terms rarely survive outside the factory's own internal records, which were seldom preserved.