500 Dinara Petrolunion, Belgrade

Petrolunion was a Yugoslav petroleum company, and this note is a corporate scrip token — issued not by any bank or government authority but by an enterprise for internal use, almost certainly as a fuel or payment voucher for employees or affiliated businesses. Such pieces occupy an awkward taxonomic space: not quite a banknote, not quite an ordinary trade token, but catalogued here because ZIN produced it on proper banknote paper using the same equipment and security printing methods it applied to official Yugoslav currency.

ZIN's involvement is the detail worth noting. The state printer taking private commissions for corporate scrip was not unusual in Yugoslav practice, but it gave pieces like this a deceptive weight of official authority they did not legally possess.