1988 Poland
1984 Norway
2002 Russia
1978 Russia
1968 Russia
1987 Poland
1988 Nicaragua
1975 Nicaragua
1999 Niger
1979 South Africa
1976 Russia
1990 Russia
400 postally used US stamps, including airmails!
Less than 60¢ per cover.
Neat variety of cork fancy cancels on early US issues.