This is a rare and valuable stamp sheet featuring the iconic AIR MAIL design, celebrating the 50th anniversary of the United States Post Office. The sheet is in extremely fine quality, with a grade of XF, and has never been hinged. It is a must-have for any serious stamp collector or enthusiast, especially those interested in aviation topics. The sheet comes with certification from the USPS, ensuring its authenticity and value. Add this unique piece to your collection today!