I have some Austrian stamps with KUK Feldpost at the top and overprinted with a new denomination in centisimos and Liras. Cannot find them anywhere in a catalog. Help
Your stamps are probably from WWI, when Austria fought Italy. I don´t have any catalogs handy, so I can´t check now whether you´ll find them on the last pages of Austria in e.g. Michel´s catalog, or under "Italy, Austrian occupation". These military field post stamps are quite common since large amounts of unused stamps were sold to dealers after the war.