India 1830 pre-stamp cover from UK to Calcutta UNRECORDED Type “CALCUTTA G.P.O.” large circular in red

Burma Postal History – 1843 “MOULMEIN/…MAY…/PAID-1-” in red on folded letter from Moulmein to Mauritius via Calcutta, “CALCUTTA/SHIPLETTER/1843 MAY 31/Inland 1/Ship Do.2/Total 3 + 1=4” Giles SR49, alongwith “CALCUTTA/G.P.O./SHIPLETTER/2 JU 2/1843” dispatch in red HG SD11 and “MAURITIUS/POST OFFICE/..A..27/1843” dc arrival. 2 other original letters enclosed. Scarce destination