Boulder N.T., Oct 3rd, 1860, manuscript postmark with matching "Paid" at right on cover to Illinois, "Answered, Jan. 18th, 1861" docketing; cover slightly reduced at right with small opening tear in bottom right corner, otherwise Very Fine, the earliest of four recorded manuscript postmarks from Boulder, Nebraska Territory (see the census in Charles W. Winter's Nebraska Postal History). Estimate  $3,000 - 4,000. Twenty five miles to the northwest of Auraria and barely across line into Nebraska Territory, Boulder came into existence as an entry point to the mountains and the newly discovered gold mines. Of the seven post offices that where authorized in the portion of Nebraska Territory that eventually became a part of Colorado, postmarks are only known from Boulder. For administrative purposes the Boulder Post Office appears as being part of Kansas Territory. $0 (Image)