First Use by the British Army of Man-Carrying Balloons on Military Manoeuvres official signed cover RAF FF17. Signed by Major General G B Sinclair CBE. Cover commemorates the 100th Anniversary from the 24th June 1880. GB Moorhen stamp and Anniversary of Military Use of Balloons British Forces Postal Service 1710 June 1980 postmark. On back shows Royal Air Force Hendon Museum postmark, Hankley Common Dropping Zone June 1980 postmark, and a First Flight Premier Vol May 1980 postmark. Carried on the maiden flights Cameron 35 Hot Air Balloon MR Peanut G-PNUT. Good Condition. All signed pieces come with a Certificate of Authenticity. We combine postage on multiple winning lots and can ship worldwide. UK postage from £3.99, EU from £5.99, Rest of World from £7.99.