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New York World&#039;s Fair 1964-1965 First Day Cover

John F. Kennedy / Riderless Horse / 1964 World&#039;s Fair First Day Cover

In Memoriam John F. Kennedy / 1964 World&#039;s Fair First Day Cover

Commemorating New York World&#039;s Fair 1964-1965 - &quot;Peace Through Understanding&quot; First Day Cover

Official World&#039;s Fair Block of Stamps First Day Cover

New York World&#039;s Fair 1964-1965 Plate Block of Stamps First Day Cover

New York World&#039;s Fair First Day Cover

New York World&#039;s Fair 1964-1965 First Day Cover