1926 (25c) Patricia Airways and Exploration Ltd. Imperforate, a full pane of eight, with never hinged gum and RED LAKE inscriptions in margins. There is a small gum blemish at centre left, adjacent to a slight bend, still quite rare (unlisted in Unitrade) and very fine. Rsv. $3,200. (Image)

Est $ 3,500

1926 (25c) Patricia Airways and Exploration Ltd. Trial Colour Proof in Green, a full pane of eight, with full never hinged gum and RED LAKE inscriptions in margins, quite fresh and very fine. A rare pane. Rsv. $2,800. (Image)

Unitrade $ 9,000

1926 (25c) Patricia Airways and Exploration Ltd. Imperforate Proof with Doubling of All Red Inscriptions, on ungummed white paper, with green frameline and red aircraft, showing a dramatic doubling of all red inscriptions including the airplanes. From the unique pane of 8, with a negligible corner crease in upper right corner, still very rare. Rsv. $1,600. (Image)

Est $ 2,000

1926 (25c) Yellow Patricia Airways Exploration, a mint never hinged complete pane of 8, showing the "route inscription in blue-black" and right stamp with "small t in TO" variety. Pencil notations in bottom selvedge, blue crayon mark at right and slightly disturbed gum in selvedge, still very fine and scarce. Rsv. $1,600. (Image)

Unitrade $ 3,825

1926 (50c) Patricia Airways Exploration, Style Three Perforated Trial Colour Proof in Buff, a mint never hinged complete pane of 8, with very light gum disturbance along the right selvedge edge, still rare and very fine. Unitrade only lists the perforated trial colour proof in deep blue (at $3,000 each stamp). Rsv. $2,900. (Image)

Est $ 3,000

1926 (50c) Patricia Airways and Exploration Trial Colour Proof on Deep Blue Paper, a mint never hinged block of four from top of pane, showing the "Small V" variety on the upper right stamp, quite fresh and extremely fine. Rsv. $3,200. (Image)

Unitrade $ 12,000

1926 (50c) Patricia Airways and Exploration Ltd. Plate Proof, a full imperforate pane of eight on white paper, without gum (as issued), with orange inscriptions and airplane, and WOMAN LAKE inscriptions in margins. Also shows the "OTT" in "LOOKOUT" variety in fourth position, quite fresh and very fine. A very rare proof pane. Rsv. $2,500. (Image)

Unitrade $ 4,450

1928 (10c) Yellow Patricia Airways Limited, a mint never hinged complete pane of 8, quite fresh and very fine. Rsv. $170. (Image)

Unitrade $ 562

1928 (10c) Patricia Airways Ltd, Rouletted, a complete pane of eight with full inscriptions and mint never hinged gum, tiny bit of missing gum in margin does not detract, very fine. Rsv. $190. (Image)

Unitrade $ 562