The common design was a key with the CEPT logo as the handle, said to open the door to a United Europe. The designer was Hans Schwarzenbach (1911–1983) of Switzerland. Liechtenstein’s design is slightly different with the key bitting shaped as an E. Most stamps were issued in March and late April. Norway did not issue any stamps.
Andorra
Belgium
Calf of Man > Isle of Man
Cyprus
Davaar Island > Scotland
France
West Germany > Germany
Greece
Iceland
Ireland
Italy
Liechtenstein
Luxembourg
Monaco
Netherlands
Isle of Pabay > Scotland
Portugal
Sanda Island > Scotland
San Marino
Spain
Switzerland
Turkey