1971 31st Anniversary of the Battle of Britain RAF Uxbridge Commemorative Cover, Battle of Britain 31st Anniversary British Force 1172 Postal Service H/S, Signed by Bob Stanford-Tuck & Air Chief Marshal Keith Park

18th September 1971 31st Anniversary of the Battle of Britain RAF Uxbridge Commemorative Cover, Battle of Britain 31st Anniversary British Force 1172 Postal Service H/S. Signed by Wing Commander Bob Stanford-Tuck & Air Chief Marshal Keith Park. Received at the Former Underground 11 Group Operations Room RAF Uxbridge cachet on flap. Very scarce cover with dual signatures. Pristine condition.