Mountain City K.T., March 2nd, manuscript postmark on manuscript canceled 1860, 3¢ Star Die entire to Illinois, Very Fine, this postmark shows the "K.T." Kansas Territory designation two days after creation of Colorado Territory. Estimate  $750 - 1,000. By 1860, prospectors had proven the existence of profitable deposits of gold and settlement was rapidly fanning out westward into the mountains. Thirty miles to the west of Denver City, placer and lode mining on the headwaters of Clear Creek led to the establishment of post offices at Mountain City and Missouri City. $0 (Image)