This stamp was one of a series of stamps that commemorated the 150th anniversary of the Revolutionary War. This series was issued to commemorate Lexington and Concord, which were the precursor to the revolutionary war. As such, only two stamps were supposed to be issued, a Lexington and a Concord, with which the minutemen were associated. The original designs are shown in the third image above. There was a movement to include Paul Revere in this series with perhaps a depiction of his midnight ride to Concord, but alas, he did not make the cut.

The vignette design depicts the statue of a Minute Man by Daniel Chester French located in Concord, Massachusetts. The top photo shows the photo today, and the second photo is the actual photo that was used for the design

The last two images are proofs of the design (619 P1 and P2)