1971 USPS Emblem Postage

This stamp was issued on July 1, 1971, almost 50 years ago exactly! It commemorates the big change of the postal system from U.S. Post Office to the U.S. Postal Service. These stamps are small (1" high) with the perfect vintage design and font. Issued in a ceremony in Washington, D.C., over 16 million were printed and released to the public.

See them here.