Silverton, Colo., Dec 20, ca. 1875 cds with circular handstamp canceling on 1874, 3Ā¢ green entire to Boston, Mass., with manuscript return address at left addressed "Silverton, La Plata Co., Col. Ter.", Very Fine, one of only a few territorial strike known. EstimateĀ $150 - 200. $0 (Image)