5c Air Mail Large Die Proof in Brown Olive, on India paper (101 x 88 mm) sunk-in on card (163 x 150 mm), from the unhardened die, without inscriptions. The card has a diagonal crease clear of the proof, still very fine and very rare.

Ex Sir Gawaine Baillie collection. (Image)

Unitrade $ 1,500

1928 5c Brown Olive Air Mail, Imperforate, mint never hinged, fresh and very fine. (Image)

Unitrade $ 525

1928 5c Brown Olive Air Mail, Imperforate Vertically, a mint never hinged block of four with great centering, very fine. (Image)

Unitrade $ 1,050

1932 6c on 5c Air Mail Surcharge, with Double Surcharge, a mint hinged block of four with natural straight edge at bottom, clearly showing the double print, off-centre as are all genuine examples, fine. A rare variety in block format and the first we have encountered.

Accompanied by a 2000 Greene Foundation certificate. (Image)

Unitrade $ 3,400

6c Air Mail Plate Proof in Blue, a vertical pair on card-mounted India paper, very fine. (Image)

Unitrade $ 400

1943 7c Deep Blue Air Mail, Imperforate, a mint never hinged horizontal pair, with small portion of "Sanabria" guarantee handstamp on back, very fine. Rare, with only 50 pairs issued. (Image)

Unitrade $ 1,200

1943 17c Bright Ultramarine Special Delivery Air Mail, Imperforate, a mint hinged left sheet margin horizontal pair, with "Kessler" owner handstamp on each stamp and portions of "Sanabria" expert handstamps, fine. Scarce, with only 75 pairs issued. (Image)

Unitrade $ 650

Two Different 17c Special Delivery Large Die Proofs in Bright Ultramarine, with CE3 (Exprês) and CE4 (corrected Exprès) spellings, both on India paper (113 x 89 mm) sunk-in on card (229 x 153 mm), with "X-G-817" die number and "Canadian Bank Note Company, Limited" inscriptions below design. Extremely fine and a rare set.

Ex Sir Gawaine Baillie collection. (Image)

Estimate $ 3,000