cover Chunar: 1831 entire letter to Calcutta showing, on reverse across join, fine oval-framed "CHUNAR/POST PAID" (HG 1) in reddish brown and Calcutta G.P.O. framed d.s., and 1834 entire letter to Patna showing a similar smudged h.s. in black (torn through on opening), the contents giving graphic details of the rescue of some European troops which had been upset in the river