This Colt Single Action, Serial No. 3964X presents an interesting characteristic found in Colt Factory Letters from the 33,000 – 39,000 Serial Range. Colt did not Factory Nickel plate any revolvers until 1877, the year of this Colt. Prior to that date all were sent to Adams Plating Co. Previous to that ALL SAA’s were Blue Finish. If you review many factory letters of this serial range, you find finish “blue”, which based on physical revolvers not correct. Perhaps a communications breakdown within the process of shipping. Anyway, this Colt letters Blue, .45, Barrel & Stocks unlisted. It was shipped on November 3rd, 1877, to a New York dealer, with a quantity of 25. This is a New York engraved Nickel finished revolver, with the style of Cuno Helfricht. Regrettably, the barrel has been reduced from 7-1/2 inches to 5-1/8 inches. The SAA has been engraved at a high level of quality, close to maximum coverage.. Then fitted ( 1877 ) with one piece Ivory grips. I might add the grips construction is as done in that period.