Lot of 50 commemorative first day issue stamp envelopes dating from the 1950s and 1960s with themes including:
Honoring the American flag (1960).
100th anniversary of the Pony Express (1960).
Commemorating the International Winter Sports Games (1960).
150th anniversary of the Louisiana Purchase (1953).
Commemorating the fifth World Forestry Congress (1960).
Condition Report Very good with minimal signs of wear.