World's First Military Stamps - 1898 Complete Mint Set of 5

These unusual octagonal stamps were created for Turkish soldiers in occupied Thessaly, part of present-day Greece, during the Greco-Turkish War of 1897-1898. The unique shape of these stamps was intended to make the letters stand out for preferential treatment. A focal point is the ornate signature of the Sultan of Turkey. (Turkey #M1-M5)