1957 6¢ Air Post - Air Force Mint Single

U.S. Scott #C49 6¢ Air Post - Air Force Mint Sheet of 50

U.S. Scott #C47 6¢ Air Post - Powered Flight Mint Single

U.S. Scott #C45 6¢ Air Post - Wright Brothers Mint Single

U.S. Scott #C40 6¢ Air Post - Alexandria, Virginia Mint Single

U.S. Scott #C25 6¢ Air Post - Transport Plane (Carmine) Mint Single