folded letter datelined "Hampton July 12th 1840", two-line "T.P. Hampton" and "Hounslow Jy 13 1840" handstamps, addressed to Toronto, Upper Canada, rated "1/-", carried on the maiden voyage of Cunard's Acadia departing Liverpool August 4 and arriving Boston August 17, overland to Pictou, Nova Scotia then by Unicorn to Quebec with August 20 transit, charged "1/4" due on Toronto, very fine and attractive maiden voyage cover