Chelmsford Postmarks. 3 folded letters; 1829 black "Chelmsford" straight line and manuscript 12Ā½ rate, 1846 red "S. Chelmsford" two-line postmark and matching 5 rate and 1846 red "N. Chelmsford" two-line postmark and matching "5" rate (matching pair), Very Fine. EstimateĀ $200 - 300. $0 (Image)