This 1957 Lower Right Corner Block of 4, Plate 1, 15c dark blue Scott #372 "Posthorn and Globe" UPU Issue stamps from Don's Classic Stamps is in Very Fine (VF) Mint Never Hinged (MNH) condition. The Unitrade Specialized Catalogue of Canadian Stamps (which uses the Scott numbering system) shows a Catalogue value of $15.00 for this block. (Item #7745)
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.