This 1973-1974 Upper Left Corner Block of 4 16c carmine rose Scott #J37i LF paper, Perf 12, Third Issue Postage Due stamps from Don's Classic Stamps is in Mint Never Hinged (MNH) condition. The Unitrade Specialized Catalogue of Canadian Stamps, which follows the Scott numbering system format in its listings, has a Catalogue value of $2.50 (in Canadian currency) for this block.  (Item #11,723)