1972 RAF Cover Commemorating 60th Anniversary of the Formation of the Squadron. Signed

13th May 1972 RAF Museum Cover Commemorating the 60th Anniversary of the Formation of the Squadron. Signed by Erich Hartmann, the most successful Germany Fighter pilot ever, accredited with 352 Kills. The cover is also signed by Lt.Colonel Norman L McDonald USAAF. He flew Spitfires throughout the African & Sicilan Campaigns & was awarded The Distinguished Flying Cross with Oak Leaf Cluster. Complete with more information on each pilot, including photographs. The cover is Number 10 of only 10. Very Scarce.