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1870 receiver barrel markings

Posted by D Miller on Tuesday, 12 January 2021, at 12:19 p.m.

I have an 1870 that is in excellent condition. I have read about the first and second manufacturing runs. There are references that suggest the first run of 1,000 were returned and rebuilt to 1870 production configuration. One major feature of the rebuild was the rear sight was moved forward as is on this rifle. The reference marks on the right side of the receiver and barrel are in perfect alignment. What I am trying to figure out is the significance of the markings on the bottom of the receiver and barrel. The marks on the bottom of the receiver and barrel look like another alignment mark made with a chisel and appears to have been struck multiple times and is in perfect alignment across the receiver and barrel joint. The edges of the mark do not show any offset or raised metal along the edges of the mark and are smooth to the contours of the receiver and barrel. On both the receiver and barrel, beside the chisel mark, is T8 that are also smooth to the contours and read from rear to front. The black on the receiver is perfect and the barrel is unblemished arsenal bright. The rifle does have an 1870 rear sight. The breech block is a thick 1868 and the latch does not have a rounded corner. The firing pin has the small eight-inch diameter striking surface. The stock still retains the ramrod retaining spoon and pin. A single cartouche of ESA is present. There are no visible marks rear of the trigger plate. The cleaning rod is double shouldered. Can anyone here suggest what the markings on the bottom of the receiver and barrel represent and what I might have as to authenticity


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