Hiltenville, Aprl 6, purple manuscript postmark and matching daub cancel on 1874, 3Ā¢ green entire to Fort Collins, 1875 year docketing at left; reduced at left, Very Fine, the only recorded postmark from this post office. EstimateĀ $200 - 300. The Hiltonville Post Office was established on October 10, 1873 and was moved to Wheatland on September 24, 1875. $0 (Image)