Vilnius 1920

This is one of the greatest find I had in a pile of "1 CZK per stamp" (CZK = Czech Crown = 0.05 USD). Not only the stamp itself is not extraordinary, but it is in a pretty bad shape with the color fading away. So what makes it a great find? It's the postmark! 11 September 1920. I really wish I had a cover from this period. The history of Vilnius in 1920 is pretty complicated. Soviet-Lithuanian Treaty was signed on 12 July 1920 which ended the Soviets to fight on a double front in the region and to concentrate solely on Poland. The Soviets left Vilnius for the Lithuanians after a heavy defeat in Warsaw against the Poles. This means that the postmark's date 11 September 1920 was only 2 months after the recovery of Vilnius. But this Lithuanian possession did not last long since on 9 October 1920 the Polish forces re-took Vilnius and proclaimed the Republic of Central Lithuania which later lead to the annexation that lasted until 1939 on the eve of WW2. Therefore, the presence of Lithuanian postal authority in Vilnius in 1920 lasted only 3 months. Pretty good for 1 crown, isn't it?