Kotor is a coastal town at the southeast end of Kotor Bay in Montenegro. After World War I, it became part of Yugoslavia.
When Axis forces invaded Yugoslavia in 1941, the country was partitioned, and Italy assumed control of Kotor. Italian postage thus became valid for use in the area.
Following the capitulation of Italy in 1943, Germany assumed control of most of Italy’s former holdings in Yugoslavia, including Kotor (also known as Boka Kotorska, or Cattaro Bay).