Country

• Czechoslovakia (2) 

  East Germany (1) Hungary (1) Poland (1) Vatican (1)

Year

• 1978 (2) 

  1965 (1) 1968 (1)

Themes

•  Architecture (1)
•  Communications (2)
•  Fine arts (1)
•  History (2)
•  Industry (1)
•  People (1)
•  Post (2)
•  Transport (1)