cover Lucknow: 1818 (24 Sept.) entire letter (toned overall) to Calcutta showing, on reverse, a good strike of the oval-framed "LUCKNOW/POST PAID" (HG 1), completed for 14a., and Calcutta G.P.O. oval d.s.; 1840's native envelopes showing strikes of HG 8, 9 and 10