In the Kingdom of Yugoslavia, there existed specific circumstances under which letters could be sent at a reduced tariff:
- Unsealed envelopes were eligible for shipment at the stationery tariff.
- Small envelopes carrying concise messages (such as business cards or greetings) qualified for postage at the rate applicable to stationery or printed matter, depending on whichever was more cost-effective.
Although these regulations were not formally enforced in 1945, a few preserved items indicate that such practices persisted.
1945 Split provisional issue, small format letter franked with 10 kn, sent locally in Dubrovnik (1.VI.45), censored in Dubrovnik (censor cancellation No. 10). A rare example of a letter franked as a stationery.
