1938 Registerd cover from Kaunas to Sofia (Bulgaria). On backside canceled TPO railway mark of Marienburg-Eydtkuhnen in Germany (Marienburg known as Malbork in Poland, Eydtkuhnen known as Eitkūnai in Lithuania and now is Chernyshevskoye (rus. Чернышевское, Калининградская область (Kaliningrad Oblast)).