Canada 1928 #C1 block of 4, stamps VF **. Airmail C1 in block of 4 stamps mint never hinged with top sheet margin with inscription. Margin is hinged. Unitrade 2021 catalog $160.00. (Image)

Est. C$ 50-75

Canada 1930 #C2 block, stamps F-VF **. 5c olive brown Air Mail, block of 4 stamps mint never hinged. Unitrade 2021 CV $180.00. (Image)

Est. C$ 45-65

Canada 1932 #C3 block of 4 VF **. Air mail issue, 6c overprinted on 5c olive brown. Block of 4 stamps mint never hinged. Unitrade 2021 catalog 120.00. (Image)

Est. C$ 35-55

Canada 1932 #C4 block of 4, stamps F-VF **. Airmail block of 4 stamps with left margin sheet. Ottawa Conference 6c overprinted on the 5c olive brown. The stamps are mint never hinged. Unitrade 2021 catalog $160.00. (Image)

Est. C$ 40-60