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 Battle of Lexington, this was based on Henry Sandhams painting of the event (second image above) which in turn was based on Doolittles print (top image).

The vignette design essay (618-E3) is the third image, followed by two other essays (618-E2 and E1).