Issued by the Republic of Austria in 1960, this striking green stamp symbolizes European unity through a modernist depiction of a cube-shaped building bearing the stylized “E” emblem for “Europa.” Designed by O. Spitzer and R. Toth, it represents the collaborative vision of the CEPT (Conference of European Postal and Telecommunications Administrations) nations, emphasizing post-war cooperation and integration. The denomination of 2.40 schillings is set against a map of Europe, reinforcing the continental theme. A hallmark of mid-century design, it’s prized among collectors for its geometric aesthetic and symbolic resonance.