1852, Prince Albert 6d. greenish grey imperforate with good to wide margins around (small part of another stamp at bottom) fine used with six-ring cancel and 'MONTREAL DE5/1855' on front of cover addressed to Niagara with poor red arrival pmk. on reverse (11.12.), the stamp was removed from cover for expertising and carefully reaffixed with hinge to original envelope, scarce cover with Behr certificate (1988) but described in wrong colour 'violet-noir' (probably due to Yvert cat.). Rare and attractive! (Tax Method: Margin System) (Image)