This 1929 12c grey Scott #156 "Quebec Bridge" stamp from the King George V "ScrolI" Issue is offered by Don's Classic Stamps in Fine+ (F+) Mint Never Hinged (MNH) condition. The Unitrade Specialized Catalogue of Canadian Stamps, which follows the Scott numbering system format  in its listings, shows a Catalogue value of $48.75 (in Canadian currency) for this stamp. (Item #8514)
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In the Don's Classic Stamps Ebay Store you will find an ever increasing selection of Canada Stamps and Covers. Therefore, shop often to have the best choice.