Bulgarian barge Dounone N 2 was to be returned to Bulgaria by Yugoslavia according to a list dated 2 August 1921

After the First World War (1914-1918) lost by the German, Austro-Hungarian and Ottoman Empires was Walker D. Hines appointed as international arbitrator responsible for the ceding of tugs and other inland vessels by Germany, Bulgaria, Austria and Hungary to the Allied Powers. For Austria respectively Hungary were the Treaties of St. Germain and Trianon leading. Lists were made of the involved vessels including some details and what their fate was to be.

A list dated Paris, France 2 August 1921 reported that the Bulgarian barge Dounone N 2 with a T.M. tonnage of 303 tons after the armistice was handed over to the Allied forces becoming property of the Serb-Croat-Slovene Kingdom (1) but of which the nationality and ownership was confirmed to be Bulgaria.

Note
1. The Kingdom of Yugoslavia was formed on 1 December 1918 with merging the provisional State of Slovenes, Croats and Serbs (officially proclaimed on 29 October 1918) with the formerly independent Kingdom of Serbia. The latter kingdom was since 28 November 1918 united with the Kingdom of Montenegro. The Kingdom of Yugoslavia was until 3 October 1929 officially titled the Kingdom of Serbs, Croats and Slovenes.

Source
Reports of International Arbitral Awards. Navigation on the Danube, 2 August 1921, volume 1. UN, 2006