cover -- 1818 and 1819 entire letters showing examples of the black 'Crutched-Cross', the former from London to Calcutta (re-addressed on arrival to Cawnpore) with the marking overstruck on circular "INDIA SHIPP LETTER/LONDON" (In.2) datestamp, the reverse showing black boxed "KING'S POSTE/COS INLD DO./181..." datestamp (details completed in manuscript; the latter from Calcutta to Ireland with the marking overstruck on black circular "CALCUTTA/POST NOT PAID" h.s., and showing framed "INDIA" in black (of London); the first item with some strengthened faults, some toning or ageing