These 1970 VF 25c Pairs (3)Scott #508+511; 508+510 & Pair 508 are in Very Fine (VF) Mint Never Hinged (MNH) condition. The Unitrade Specialized Catalogue of Canadian Stamps (which uses the Scott numbering system) shows a combined Catalogue value of $12.50 for the 3 pairs. (Item #11,786)
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.