Idaho, Col. T., Feb 4, exceptional strike of cds on 1870 cover to Philadelphia, Pa., franked with manuscript canceled 1869, 3Ā¢ ultramarine, with original enclosure headed Gibson Gulch, Extremely Fine, this being the only recorded example of the "Idaho, Col. T." circular date stamp. EstimateĀ $400 - 600. $0 (Image)