This full sheet of 50 stamps, Scott #2006-2009, features the Knoxville World's Fair and is a great addition to any stamp collection. The stamps are in pristine condition and have never been hinged, ensuring their quality. The face value of each stamp is 20 cents and the sheet includes multiples of each stamp.The stamps were issued in the United States between 1981-1990 and showcase the theme of science. While the stamps are ungraded, they are certified to be authentic and would make a perfect gift for any stamp collector or enthusiast. This item falls under the categories of Plate Blocks/Multiples, United States, and Stamps. Don't miss out on the opportunity to own this unique piece of history.