Bicentennial of America's Postal Service First Run Envelope Set of 18 Stamps

This is a set of 18 First Day of Issue stamps on 13 envelopes as part of the United States Postal Service Bicentennial in 1976. A couple of the envelopes include the First Day of Focus brochure. These envelopes are in very good conditoin with a few have some bent corners which can probably be straightened. There are no rips, tears, or creases. They stamps are .13 and .10. - Bicentennial Era - The Seafaring Tradition - Bicentennial of America's Postal Service - Clipper Ship to Satellite - Bicentennial of America's Postal Service - Steam Locamotive to Streamliner - Bicentennial of America's Postal Service - Jennys to Jets - Bicentennial of America's Postal Service - Ben Franklin - Bicentennial of America's Postal Service - Stagecoach to Truck - Bicentennial Era - The American Farmer - Bicentennial Era - The American Homemaker - Spirit of '76 - Great General of the Revolution - George Washington - Spirit of '76 - Great General of the Revolution - Nathaniel Greene - Spirit of '76 - Great General of the Revolution - Henry Knox - Spirit of '76 - Philadelphia '76 - Interphil '76 - The Seventh USA International Philatelic Exhibition