Series "2" imperforate proof pane printed in green on yellow, gummed paper very similar to issued Style One. Shows frame and side margin inscription only; no airplane or other marginal / route inscriptions, small marginal surface thin at left, slight gum disturbance mostly in margin. An exceedingly rare and most striking pane, VF NH (Unitrade CL13Pi; cat. $9,500) (Image)

Estimate 2500 $

Three different proof panes, each with green frame on white ungummed paper and showing progression of the official route inscriptions as follows: Pane 1) Misaligned route inscription printed in BLACK, incomplete lettering in Positions 2, 5, 6. Pane 2) Corrected route inscription printed in BLUE, incomplete lettering in Positions 5, 6. Pane 3) Corrected route inscription in BLUE, complete lettering. All three panes shows the small "t" in "TO" variety - and have printer's pencil / pen annotation. A wonderful showpiece and no doubt a unique group, VF (Unitrade CL13Piii, v, variety; cat. $13,800 for basic listed proofs) (Image)

Estimate 5000 $

Matching pair of lower margin series "4" proof blocks of six, both on white ungummed paper, showing ESSAY of the RED LAKE / AIR MAIL marginal inscription - in noticeably larger & thicker Gothic type; first block without airplane and second with airplane in red, latter with horizontal fold through last row. Visually striking and rarely seen, VF (Unitrade CL13Pviii, CL13Pix; cat. $9,000 as singles) (Image)

Estimate 2500 $

Two imperforate proof panes of eight, both series "4" printed on white ungummed paper with frame and side margin inscription in green; no airplane or route inscription. Displaying marginal inscriptions in red - First pane with the trial RED LAKE narrow spaced (15.5mm) and Second pane with RED LAKE normal spaced (20mm) as found on issued Style One. Trivial flaws; a rare duo, VF (Unitrade CL13P variety; unlisted even as singles) (Image)

Estimate 3500 $

Series "4" top margin pair and bottom margin block of six for a reconstructed pane of eight, with green frame and showing red colour including the AIRPLANE DOUBLED, printed on white ungummed paper; pair has negligible thin in margin. A remarkable and unlisted DOUBLE AIRPLANE proof, VF (Unitrade CL13Pxiv variety; cat. $6,000+) This proof is similar to Unitrade CL13Pxiv; but the latter only shows single impression of the red airplane. (Image)

Estimate 4000 $

The complete set of four trial colour proofs in panes of eight - on Canary, Buff, Green and Deep Blue papers, with full original gum; perforation, coloured frame, airplane and red marginal RED LAKE and green route inscriptions as the issued Style One airmail stamp on yellow paper. Two panes shows slight gum disturbance confined to selvedge. An extraordinary set, VF NH (Unitrade CL13 trial colour; cat. $24,000) (Image)

Estimate 7500 $

A similar lot, three panes shows slight gum disturbance confined to selvedge, gum crease on one stamp in green pane. A fabulous and very rare set, VF NH (Cat. $24,000) (Image)

Estimate 7500 $