Letter, correctly franked with 50 cent. and cancelled with a bilingual stamp LAIBACH 1 / LJUBLJANA 1 from the period of German occupation, was sent the day before the liberation of Ljubljana, on 8th of May 1945. The letter was censored and delivered just under the new military government, sometime prior to the suspension of all postal traffic that happened on 12th of May.
Letter sent loco Ljubljana under the German occupation (8.V.45) but censored and delivered by the Partisans after the liberation of Ljubljana (9.V.45). The acronym "V. K. P. Lj. 1" most likely means "Vojna Komanda Pošta Ljubljana 1" - "Military Command Post office Ljubljana 1".