1924 (25c) Green Laurentide Air Service Ltd. a mint never hinged pane of two, fresh and very fine. (Image)

Unitrade $ 487

1926 (25c) Red on Yellow Jack V. Elliot Air Service, with Zig-Zag Background, a mint pane of 8, stamps are never hinged and there is a small hinge on selvedge at left (catalogued as hinged). Position 8 shows the "white spot" variety, overall fine. (Image)

Unitrade $ 600

1926 (25c) Red on Yellow Jack V. Elliot Air Service, with Swastika Background, Imperforate with Inverted Centre, a mint lightly hinged block of four, with the upper left stamp showing the inverted "AIR SERVICE" inscription, very fine. (Image)

Unitrade $ 1,150

Two Different Proofs of the Elliot-Fairchilds Air Service Issue, both vertical pairs showing the "filled-in wing" variety from position 1 at top. Includes a black and yellow on white paper (no gum) and a red and yellow on white paper (lightly hinged at top), very fine. (Image)

Unitrade $ 1,200

1926 (25c) Patricia Airways "Style One" Trial Colour Proof, a perforated block of four on never hinged, gummed buff paper, very fine and fresh. Accompanied by a 2018 Greene Foundation certificate. (Image)

Unitrade $ 2,100

1926 (25c) Patricia Airways and Exploration Ltd. Imperforate Trial Colour Pane in Canary, a full pane of eight, with never hinged gum and all inscriptions in margins. There is a small gum blemish at centre left, adjacent to a slight bend, still quite scarce and very fine. Rsv. $2,200. (Image)

Unitrade $ 6,000

1927 Patricia Airways "Style Two" with 5c Ascending Type B Overprint in Black, mint hinged, scarce and very fine. (Image)

Unitrade $ 1,250

1927 25c Blue Yukon Airways and Exploration Co. Ltd. Variety, a booklet containing one complete pane of 10, which appears to have a light double print. The pane has been separated below the second stamp from top (hinged back together) and the front and back covers were separated in the same position as the stamps, the back cover rejoined by tape and the front cover still detached. A rare variety, and the best centered of the two such we have seen, very fine. Accompanied by a 2012 Greene Foundation certificate stating "NH". (Image)

Unitrade $ 10,000

1929 (10c) Black Commercial Airways Ltd. with VIA AIR, a mint hinged block of four, with inscription sheet margin at left, very fine. (Image)

Unitrade $ 640

Valuable Group of Mint Semi-Official Airmail Issues, all mint never hinged unless noted, with CL #s 12 (tête-bêche pair), 25 (upper right corner pair), 25a (lightly hinged upper right corner single), 25b (hinged pair, NH single and NH upper right corner pair), 28 (4x sheet margin singles), 29a (three singles), 30 (8x NH and one lightly hinged, all with inverted overprint), 30c (single with inverted overprint), 41, 43 (x2), 44 (block of four), 48, and a 1928 "Whitehorse Star" complete newspaper mailed from White Horse to Atlin, franked with a CL42. Overall fresh and very fine. (Image)

Unitrade $ 5,751