This is a 1971 USA 11 cent Jet Airmail Entire #UC43 stamp features aviation as its topic. The cachetmaker is ARTMASTER and it is an unaddressed, ungraded stamp with a red, white, and blue color scheme. The cover size is 6 3/4 (6 1/2 x 3 5/8) and the cancellation type is First Day of Issue. It was issued in Williamsburg, Pennsylvania and manufactured in the United States. A very nice addition to your collection.