The first postage stamps of Serbia were issued on July 1, 1866. These were three miniatures with a portrait of Prince Michael III and the inscription Serb. "TO. Serbska Posta. The stamps were printed in Vienna. In 1866 - 1868, this series of stamps was printed in Belgrade with clichés transferred from Vienna. The stamps differ from the Viennese stamps in their perforation (9½ instead of 12) and paper.