Dusetos is a town in Aukštaitija, 35 km north-east of Utena. In World War One it was passed through by Division Beckmann on September 12, 1915. During the German withdrawal from Russia at the end of 1918, Red Army units came to Dusetos area in late December 1918. In the War of Independence, Lithuanian regulars regained Dusetos in early June 1919.
In the czarist period, Dusetos had a post office named Dusiaty but none during the German occupation. During the brief period of Bolshevik rule in the first half of 1919, a post office (Dusiaty) was planned or actually set up, but there is no surviving evidence of its activity.
A mandate to open a post office in Dusetos was issued to Antanas Valavičius, effective from April 16, 1920. For stamps, Dusetos had Fourth Berlin Issue followed by the Sėjėjas Issue etc.
In the absence of a regular postmarker early cancelling was done in manuscript showing the place and, probably, the date. So far, no other provisional markings have been recorded.
By late 1920(?) Dusetos was provided with a standard calendar-type postmarker.
Known provisional markings:
Cancelling in manuscript:
No date single, Berlin IV 60 [colln. Jankauskas]