This Pair of 1929 12c grey Scott #156 "Quebec Bridge" stamps from the King George V "ScrolI" Issue is offered by Don's Classic Stamps in Fine+ (F+) Mint Hinged (MH) condition, with hinge/paper remnants. The Unitrade Specialized Catalogue of Canadian Stamps, which follows the Scott numbering system format  in its listings, shows a Catalogue value of $65.00 (in Canadian currency) for this pair. (Item #8515)
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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.