Helena, Colo., Jun 28/74, manuscript postmark on corner card cover to Framingham, Mass., franked with manuscript canceled 1873, 1¢ ultramarine, horizontal strip of 3, accompanied by second cover from correspondence with similar franking, no postmark and "George D. Merriam, Centerville, Lake County, Colorado" corner card (in lieu of postmark), with original 1875 enclosure regarding mining; first cover reduced at right, a Very Fine pair, a rare duo, this being one of two known territorial postmarks from Helena and quite possibly the only territorial usage from Centerville. Estimate  $400 - 600. $0 (Image)