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According to the late Don Ware in his book "Remington Army and Navy Revolvers", your revolver was manufactured in May of 1864. In a letter dated Aug., 8, 1864 a request for 1000 Army revolvers for the state of New Jersey was sent to Remington. Cost was $12/revolver. According to information found in the National Archives by Don Ware indicates that none of the Remington revolvers purchased by the State of New Jersey during the war were issued. This accounts for many of these NJ revolvers being found in excellent condition. Serial numbers are usually in the 58000-75000 range.
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George McAllister