cover 1859 (31 July) envelope from Montreal to New York, bearing 1859 perf. 11¾ 3d. red in combination with 1859 (July) 5c. red (small defect in one corner), both cancelled "21" and with despatch c.d.s. in lower left corner. An extremely rare and important mixed issue franking of which only three or four examples are recorded. B.P.A. Certificate (1982)