Great War flown cover The Battle of Cambrai, 20 -28 November 1917. Cover illustrates n Airco DH5 attacking German positions and tanks moving up towards the Hindenburg Line. Special pictorial 80th Anniversary postmark 'The Battle of Cambrai' 20 Nov. 1997. Signed Lieut. Guy Botwright (Royal Army Service Corps, served at Cambrai). 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 Â£3.99, EU from Â£5.99, Rest of World from Â£7.99.