cover Patna: 1818 (Oct.) part entire to London showing, on front, four rare handstamps comprising the intaglio tombstone "P.O./Patna/Sea/Postage/Paid" (HG 5, one recorded), framed "KINGS SEA/POSTE PAID/CALCUTTA" in red (HG SD5), "CALCUTTA/PACKET LETTER" oval d.s. (HG SD7) and the double-framed "INDIA/PACKET LETTER/PAID TO/LONDON" in red. Quite remarkable. Photo