Lower margin mint block with series "2" in lower left corner, with official Blue-Black route inscription and ESSAY of the RED LAKE / AIR MAIL marginal inscriptions in noticeably larger & thicker Gothic type; also shows the small "t" in "TO" (Pos 8) variety on lower right stamp, lightly blemished gum of no importance as this is believed to be the only known mint examples of this striking essay, VF OG (Unitrade CL13c Essay) This essay, with green and blue-black route inscriptions, is known on July 5 & July 7 First Flight covers. (Image)

Estimate 2500 $

Lower margin mint horizontal pair showing series "4" at lower left, with green route inscription, right stamp has the small "t" in "TO" variety (Pos 8), VF NH (Unitrade CL13 + b) (Image)

Cat. Value 705 $

Series "1" mint pane of eight imperforate vertically, with green route inscriptions, well centered with lovely fresh colour, light gum disturbance, VF OG (Unitrade CL13a) (Image)

Cat. Value 5000 $

A similar lot, some light printing ink offset on gum side, VF NH (Cat as hinged) (Image)

Cat. Value 5000 $

Lower margin mint horizontal pair as above, VF OG (Image)

Cat. Value 1250 $

Series "1" mint pane with official Blue-Black route inscription, lower right stamp has small "t" in "TO" variety (Pos 8), VF NH (Unitrade CL13c + d) (Image)

Cat. Value 3825 $

A similar lot, overall light gum disturbance, VF OG (Image)

Cat. Value 2550 $

Series "3" mint pane of eight with ascending 5c overprint (Type B) in black, minor perf separation confined to sheet margin. A very scarce sheet, undercatalogued when compared to other airmails issued in similar quantity (200 stamps), VF NH (Unitrade CL15) (Image)

Cat. Value 3600 $