This classic 1916 Austrian definitive features a finely engraved portrait of Emperor Ferdinand I, part of the wartime "Kaiserreich" series designed by Koloman Moser and engraved by F. Schirnböck. The stamp showcases deep brown toning with strong Art Nouveau ornamental framing typical of Moser’s style. Issued during World War I, this value paid domestic letter-rate components across the empire. The example shown is postally used, adding historical postal authenticity. A staple in early 20th-century Austria collectors’ albums, appreciated for its refined engraving and imperial symbolism.