Hungary allowed by Allies to have some small vessels for police tasks in the Danube according to the Weekly Intelligence Summary No. 41 dated 15 October 1921

An item reported that at the Conference of Ambassadors the recommendation of the Commission of Control was accepted to allow Hungary for police tasks on the Danube and tributaries 8 patrol boats, 2 large and 10 smaller motor launches.

Source

The National Archives, Kew Gardens, England CAB-24-129-24