Canon City, C.T., Aug 30th, manuscript postmark on 1861 cover to Barnard, Vt., franked with manuscript canceled 1857, 3Ā¢ dull red; repaired nicked corner at lower left, otherwise Very Fine, the earliest recorded postmark from Canon City. EstimateĀ $150 - 200. At the entrance to the Royal Gorge of the Arkansas, Canon City became a transportation and supply center for the surrounding territory. This office was established in Kansas Territory December 13, 1860 and transferred to Colorado Territory in 1861. $0 (Image)