Lot 8851860, 24¢ gray lilac, vertical pair, tied NYFM red circular grid cancels, matching "N. York, Br. Pkt. '38' Apr 30, 1861" exchange cds, carried by Cunard Line Niagara from Boston May 1st to Liverpool arriving May 12th, red "London, Paid, 12 MY 61" arrival cds; flap tears and some edge wear, Very Fine and scarce vertical pair on cover.
Scott Nos. 37 $1,000 + as single to England.
Cover was prepaid two-times the 24¢ treaty rate with a two-times the 19¢ credit to G.B.