Austria

1991 The 5th Anniversary of the Rise of St. Poelten to Provincial Capital

1991 Completion of the Karawanken Tunnel

1991 Day of the Stamp

1991 The 100th Anniversary of Museum of Art History

1991 The 1200th Anniversary of Tulln

1991 The 100th Anniversary of Army Historical Museum

1991 The 500th Anniversary of Grein

1991 Vorarlberg State Exhibition in Hohenems

1991 Wernberg Cloister

1991 EUROPA Stamps – European Aerospace