Postage due, service and airpost stamps
Postage due, official, and airmail stamps of the Slovak State document specialized postal services during the years 1939–1945. The category includes surcharge issues and service-related emissions.
Slovak State service, postage due and airmail stamps form a specialized area of wartime philately.
Special postal services 1939–1945
These issues were used for official correspondence, airmail services, and postage fee enforcement.
- official and service stamps
- postage due issues
- airmail emissions
- wartime postal history
A focused and historically important collecting field.