Serbian poster stamp

This is a poster stamp from the German series called ‘Welt in Waffen’, or World at Arms. This is number 11 of a series of 12 stamps, and shows examples of troop branches in the Serbian army, specifically cavalry, artillery officer, and cavalry. The first 10 stamps in the series featured soldiers from Germany, Austro-Hungary, Italy, America, Russia, England, France, Turkey, Greece, and Bulgaria. Th…