Air Post Semi-Official stamps. 1924, Laurentide Air Service with ''Canada 1924'' added, (25c) red, booklet pane of two values, large part of OG (some paper adhesion on reverse), VF, C.v. CAD$500, Est. $100-$150 (Image)

Air Post Semi-Official stamps. GROUP OF AIR POST SEMI-OFFICIAL STAMPS: 1926-32, 28 stamps, starting with Elliot-Fairchild, representing several plate varieties, such as ''filled wing'' on No.CL9, serif and snow variety on No. CL46, nice quality material, a few without gum, generally full OG, NH or LH, F/VF, Unitrade C.v. CAD$830, Est. $150-$200 (Image)