This 1929-1930 Block of 4 AIR FEE 10c black Scott #CL48 Commercial Airways Ltd Air Post Semi-Official Issue stamps from Don's Classic Stamps is in Very Fine (VF) Mint Never Hinged (MNH) condition, with minor gum disturbance and a few shallow gum/paper folds. The Unitrade Specialized Catalogue of Canadian Stamps, which follows the Scott numbering system format in its listings, shows a Catalogue value of $75.00 (in Canadian currency) for this block.  (Item #9080)