USA 25 cents Pennsylvania State
USA 25 cents West Virginia
China - Republic 1 jiao
China - Republic 20 cents
Germany - GDR 10 mark 175th Anniversary - Humboldt University of Berlin
Germany - GDR 20 mark 200th Anniversary - Birth of Carl Friedrich Gauss
Andorra
Australia
Austria
Belgium
Canada
China
Cyprus
Germany
Spain
Estonia
Finland
France
United Kingdom
Greece
Croatia
Ireland
Italy
Japan
Lithuania
Luxembourg
Latvia
Monaco
Malta
Netherlands
Portugal
San Marino
Slovakia
Slovenia
United States
Vatican City 
