Popular and sought after by philatelists, overprint series of Czechoslovak stamps. The so-called Posta Ceskoslovenska 1919. These stamps were issued shortly after the establishment of the independent republic by overprints on Austrian and Hungarian stamps. In this editions, you can find the most valuable Czechoslovak stamps ever. There are several types of overprints, which were forged many times to the misfortune of philatelists and were finished afterwards. Always buy the more expensive items only with a guarantee or the stamps verified by experts.