This image comes from an order form for “Official National Sam Ervin Fan Club Paraphernalia,” published by the National Sam Ervin Fan Club (headquartered in Stanford, California?). The fan club offered t-shirts, posters, buttons, and even a free membership card for “fans of ‘Uncle Sam,’ Watergate-watchers, collectors of political memorabilia, and other patriotic Americans.”
For more information on Senator Sam Ervin, see a biographical sketch from the Biographical Directory of the U.S. Congress or the Washington Post obituary for Ervin from 24 April 1985.