White First Day Covers

Saluting the U.S. Postal Service Zip Code System 1974 First Day Cover

75th Founding Anniversary Veterans of Foreign Wars First Day Cover

Preserve the Environment First Day Cover

Expo 74 Preserve the Environment First Day Cover

Preserve the Environment Man &amp; Water First Day Cover

Preserve the Environment Our Earth is not Just Dust Under Man&#039;s Feet First Day Cover

Expo 74 Preserve the Environment First Day Cover

100th Running Kentucky Derby 1974 First Day Cover

Horse Racing First Day Cover

Skylab Saluting United States Space Achievements First Day Cover

Skylab First Day Cover

Skylab First Day Cover

Centennial Universal Postal Union First Day Cover

Centennial Universal Postal Union First Day Cover

Centennial Universal Postal Union 1874-1974 First Day Cover

Centennial Universal Postal Union First Day Cover

Centennial Universal Postal Union 1874-1974 First Day Cover

Centennial Universal Postal Union First Day Cover

Centennial Universal Postal Union First Day Cover

Centennial Universal Postal Union 1874-1974 First Day Cover

Our Mineral Heritage Series First Day Cover

Our Mineral Heritage First Day Cover

Our Mineral Heritage Series First Day Cover

200th Anniversary First Continental Congress 1774-1974 First Day Cover