Other countries–Stamps of Slovenian interest

Kingdom of Yugoslavia

,,Zeppelin. Cover (trimmed corners, Dujmić), franked with 3 Din. sent from Oroslavlje (13.X.31) to Freidrichshafen, uprated by 4 RM and sent on 17.10.31 with Graf Zeppelin on 3rd South America flight 1931 via Rio (20.X.31) to Washington. Si. 133, Mi. 229a. Very rare.