1842 MAIL LONDON TO EXETER, INSIDE FLAP 'IMPROVED SAFETY ENVELOPE' IMPRINT IN GREEN. Envelope London to Exeter 1d (SG8), cut into tied black Maltese cross of London, on reverse London date stamp JA 24 1842 and 'EXETER' date stamp JA 25 1842. Inside flap very unusual oval imprint green on white 'IMPROVED SAFETY ENVELOPE/MITCHELL AND SON, 39 CHARING CROSS/REGISTERED/No.483/18 NOV 1840'. Unusual. (Ref 145409).
