This Postal Commerative Society, 22K Gold Plated, stamp cover commemorates the Knoxville World's Fair and features a Breeder Reactor. The stamp was issued on its First Day of Issue in 1982 in the United States. The denomination is 20 cents and the cancellation type is First Day of Issue. The stamp cover is ungraded and uncertified. It is a great addition to any stamp collection and a valuable piece of history.