The 10-cent Military Services Uniforms Bicentennial commemorative stamps were first placed on sale at Washington, DC, on July 4, 1975. The block of four designs printed on the same sheet shows uniforms worn by the Continental Army, Navy, Marines, and American militia during the Revolutionary War.
Edward Vebell designed the stamps, which were issued in sheets of fifty, with an initial printing of 150 million.
Reference:
Postal Bulletin (May 29, 1975).
Glossary