This rare US 1st Day Of Issue Stamped Envelope from 1957 is a must-have for any stamp collector, teacher, or anyone interested in the right to a free education. The envelope features the 100th Anniversary of the National Education Association and is a unique piece of American history. Also included in this envelope is a 1957 map of Philadelphia as well as an unused postcard featuring the proposed NEA headquarters in our nation's capital. Don't miss out on the opportunity to own this piece of history.