Marietta (North West Territory). Manuscript postmark on 1798 folded letter to Berford, N.H. to the care of the postmaster in Amherst, matching manuscript "25" rate for over 450 miles, letter datelined January 27th, Very Fine, very rare and one, if not the earliest usages from Marietta. ASCC $3,500. Estimate  $1,000 - 1,500. $0 (Image)