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. $2,500. (Image)

Unitrade $ 9,000

1926 (25c) Patricia Airways and Exploration Ltd. Imperforate Proof in Green Only, a pane of 8 on fully gummed, never hinged yellow paper, the so-called "Style 2" showing no airplanes or other marginal / route information which would have been printed in red. There is a small thin at left of "AKE", still an exceedingly rare and visually impressive pane. Rsv. $4,000. (Image)

Unitrade $ 9,500

1926 (25c) Patricia Airways and Exploration Ltd. Part Imperforate Proof in Green Only, a pane of 8 on fully gummed, never hinged off-white paper, with the top pair perforated horizontally, rest of the stamps are imperforate. The pane is printed in green only, therefore missing the airplane, route and marginal inscriptions that ended up being printed in red in the issued stamps. An incredibly rare and unusual item, worthy of the best semi-official collections. Rsv. $3,200. (Image)

Est $ 3,500

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 and margin inscription at right. From the unique pane of 8, with a negligible corner crease in upper right corner, still very rare. Rsv. $2,800. (Image)

Est $ 3,000

1926 (25c) Patricia Airways and Exploration Ltd. Imperforate, a full pane of eight, with never hinged gum and RED LAKE, etc. 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. $2,900. (Image)

Est $ 3,000

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. $2,600. (Image)

Est $ 3,000

1926 (50c) Patricia Airways and Exploration Ltd. Imperforate Proof with Green Frame, and inscriptions at sides, but no airplane or route information, on never hinged gummed yellow paper. Light corner bend lower left and crease in margin at right, still a very rare proof pane. Rsv. $1,800. (Image)

Unitrade $ 6,500

1926 (50c) Patricia Airways and Exploration Ltd. Imperforate Group of Three Different Imperforate Trial Colour Proof Panes, each is printed in black on buff coloured paper, showing a progression of the side inscriptions, with three different varieties of the lettering, etc. All three have previously been folded, affecting a few of the stamps, and there are edge faults that could easily be trimmed off, still very rare and desirable. Rsv. $6,400. (Image)

Unitrade $ 19,500

1932 Canadian Airways Ltd. Unadopted Surcharge Overprint Essay in Violet, a mint never hinged vertical pair with sheet margin at top. The gum has very light fingerprints and the top stamp has a light paperclip indentation, still a rarely offered and desirable essay. Rsv. $1,800. (Image)

Unitrade $ 2,500