Fort Lupton C.T., Apri1 23, 1867, manuscript territorial postmark on cover to Grand Rapids, Mich., franked with manuscript canceled 1861 3¢ rose; couple minor edge tears, Very Fine, one of only a few known postmarks from Fort Lupton. Estimate  $400 - 600. This early fur trading post was established in 1836 on the south side of the South Platte River. It was revived as a stage stop on the road to Denver and obtained a post office in January 1861 while still part of Nebraska Territory. It became part of Colorado Territory the next month. $0 (Image)