The listing, SIX First Day Issue Envelopes has ended.
First Day Envelopes included:
200th Anniversary of the Birth of Betsy Ross (1952)
100th Anniversary California Statehood (1950 with 4 stamps)
150th Anniversary of Indiana territory (1950)
Joel Chandler Harris (1948)
National Capital Sesquicentennial (1950)
Sesquicentennial of the National Government (1950 with 4 stamps)