Soviet stamps began to be issued from December 9, 1940. They circulated until June 1941 together with Lithuanian stamp issues of the 1930s, initially at a ratio of 1:1 between litas and rubles. From November 25, 1940, the litas was devalued at a ratio of 1 litas : 0.90 ruble. Lithuanian stamps officially lost their postal validity from the following day after the complete abolition of the litas currency on March 23, 1941.
However, this regulation was not fully implemented until the beginning of the occupation of Lithuania by German troops from June 22, 1941, so that Lithuanian-Soviet mixed frankings occur unclaimed. The illustration shows such a mixed currency franking, where the stamp was calculated at 30 Lithuanian cents at 27 kopecks and franked with 5 kopecks (rounded down) to form the 30-kopeck franking of a domestic letter.