This striking red issue from Austria-Hungary (1915) belongs to the Military Fieldpost (“Feldpost”) series of World War I. It depicts Austro-Hungarian artillery troops operating a heavy field howitzer, symbolizing the might of the imperial forces during wartime. The ornate frame reads “Kaiserliche Königliche Österreichische Post” (Imperial and Royal Austrian Post), reflecting the dual monarchy’s formal title. Designed by Koloman Moser, a leading figure of the Vienna Secession movement, and engraved by F. Schirnböck, this stamp blends art and wartime realism. Collectors value it for its historic and artistic merit as one of the most iconic wartime issues of Austria.