The theme was nature conservation. Only two countries (Gibraltar and Iceland) used the four CEPT letters instead of the official logo. Most stamps were issued in late April or in May.
Andorra
Austria
Azores
Belgium
Cyprus
Denmark
Faroes
Finland
France
West Germany > Germany
Gibraltar
Great Britain
Greece
Guernsey
Iceland
Ireland
Isle of Man
Italy
Jersey
Liechtenstein
Luxembourg
Madeira
Malta
Monaco
Netherlands
Norway
Portugal
San Marino
Spain
Switzerland
Sweden
Turkey
Turkish Republic of Northern Cyprus
Yugoslavia