1961-63 Russia
1972-75 Russia
1960 Russia
1961 Russia
1978 Russia
1958-59 Russia
1963 German Democratic Republic
1959 Hungary
1963 Russia
1957 Russia
1977 Russia
1967 Russia
1986 Russia
1963-64 Romania
1961 German Democratic Republic
1964 Russia
400 postally used US stamps, including airmails!
Less than 60¢ per cover.
Neat variety of cork fancy cancels on early US issues.