Issued in 1966 by the Republic of Austria, this 1.50 schilling stamp marks the nationwide introduction of postal codes. The stamp features a shaded relief map of Austria with the nine postal code regions numbered from 1 to 9 in red. Above the map, the bold red text “POSTLEITZAHLEN!” (Postal Codes!) emphasizes the campaign’s message. A classic post horn symbol sits just below the heading, symbolizing the Austrian postal service. Designed by K. Gessner, this stamp is a fascinating philatelic piece representing a key modernization in postal logistics.