North Vietnam, Shoot-Down of the 3,000th U.S.Aircraft over North Vietnam, June 25th, 1968; Postal Authorities kept busy with the successful defense scheme which counted the number of U.S. aircraft…
North Vietnam, Shoot-Down of the 3,500th U.S.Aircraft over North Vietnam, June 20th, 1972, Michel Nr. 697-698; Two stamps, both in 12 xu nominals were issued in perforation 11.0. Here…