1904 stationery entire envelope, 1c green, additionally franked with two horizontal pairs (originally a strip of four) of 20c olive green, exceptionally well centered, v.f., registered from Windsor, Ontario (June 10, 1910), with Detroit arrival pmk (same day) on back, with 2006 Vincent Graves Greene certificate (Cat No. 94) (Image)

Est.$150

1932 (27 July) flown cover to USA, final leg of the Trans-Atlantic flight Germany-Iceland-Canada-USA (Von Gronau) with appropriate cachet, plus "Souvenir of First Through Flight Montreal, Canada", also U.S. franking (10c Lindbergh) added on back and tied by Milwaukee arrival postmark, v.f. (Image)

Est.$250

1935 Law Stamps, George VI, 20c on 10c blue, block of four, n.h., v.f. (Image)

Est.$150

1936 2nd Hindenburg Flight from Montreal (May 18) via New York to Frankfurt, with "Via Airship Hindenburg" label, franked on both sides (paying total of 70c), with appropriate transit and arrival pmks, v.f. (Image)

Est.$300

1936 Hindenburg flight (1 May) from Montreal via New York to Germany, mixed franking with U.S. adhesives (cancelled in New York), appropriate cachet and Frankfurt Hindenburg LZ-129 arrival cachet and cds, some toning and stains, otherwise fine and undoubtedly rare Canada-USA Hindenburg combination, signed Gappe (Image)

Est.$500

1936 Hindenburg flight from Hamilton, Ontario to London, England, appropriate violet cachet, with Frankfurt arrival and "Mit Luftschiff Hindenburg Befordert" handstamp on back, fine (Image)

Est.$300

1851 3p red, diagonal half used in combination with 6p olive yellow, large margins on three sides, just in at right, bright colors and fresh, tied by grids on small mourning cover to England, St. Thomas, May 21, 1855 pmk alongside, endorsed "per steamer via Halifax", red "Paid Liverpool 17 June" struck on arrival, "British 5d Claim" handstamp, filing folds away from the stamps, fine 7 1/2p rate cover to England (Cat No. 1b,2) (Image)

Est.$2,500

1932 DO-X surcharge, $1.50 on $1 blue, lightly canceled, v.f., cat. $275 (Cat No. C12) (Image)

Cat. $275, Est.$150

1869-1903 group of six covers or cards, with 3c used on registered cover from Cathcard; four covers used in 1903, mainly Yukon River Steamboat usages from White Horse, Y.T. to Vancouver, etc., some with "Independent S.S. Casca - Flying Weekly Between White Horse and Dawson" stationery enclosures, mixed condition, scarce (Image)

Est.$500