This 1972 Lower Left Se-Tenant Block of 4 15c multicoloured Scott #585b GT2 [Tagged] Earth Sciences 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 follows the Scott numbering system format  in its listings, shows a Catalogue value of  $17.50 (in Canadian currency) for this block. (Item #8033)