Hello, I wasn't reall sure what these stamps were when I bought them but I really liked the overprints and the fact that they were imperfs. I have since found out that these are Yugoslavian stamps overprinted, surcharged and used in Carinthia which was a stste in the Republic of Austria. I haven't done a lot of research yet but as I understand itCarinthia, at the end of WW1, was divided between Austria and Yugoslavia. In 1920 a referendum was held allowing the Carinthians to vote on whether to remain a part of Austria or become a part of Yugoslavia. The funds from the surcharged stamps (below) were used to enable Carinthians to travel to vote on the referendum. I have included a Wikipedia link that goes in great detail on this.
Thank you
David


http://en.wikipedia.org/wiki/Carinthia_(state)