Philadria d.o.o. - katalog 12. dražba - oktober 2014
,4 U (4),Military post postcard, franked with the vertical strip of four imperforate 15 vin. stamps with gutter between the third and fourth stamp, sent from Ljubljana (2. III. 21) to Berlin. Extreme rarity, only a few used postcards with imperforate 15 vin. stamps are known !