This 1938 Block of 6, Plate 1, 20c dark carmine Scott #E8 Special Delivery stamps, with a Plate 1 imprint in the top Tab, from Don's Classic Stamps is in Original Gum (OG) Very Fine (VF) condition. The middle stamp - top row - is Mint Hinged (MH). The other 5 stamps are MNH. The Unitrade Specialized Catalogue of Canadian Stamps, which follows the Scott numbering system format  in its listings, shows a Catalogue value of $487.50 (in Canadian currency) for this block of stamps. (Item #1369)

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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.