This is one of the rarest of all Antique Colt Firearms. This Colt 1861 Navy Revolver is one of only 3 or 4 I have ever seen offered for sale that are configured with a four-screw frame and a cut recoil shield to facilitate their use with a shoulder stock. Based on all the books and catalogs I've seen over a 30 year period (that includes publications of sales and auctions dating back to the 1920's) I'd be surprised if they manufactured more than 10 - 20 of these guns. An 1851 Navy cut-for-stock is downright common compared to these. To put icing on the cake, this gun is historically inscribed to a Lieutenant of the New York Volunteer Engineers. The 1st New York Volunteer Engineers served in South Carolina from 10/61 - 4/64 with duty at Forts Wagner, Beaureguard and Pulaski, operations against Morris Island, Fort Wagner and Fort Sumpter. After 4/64 operations at Petersburg and Richmond, construction of Fort Hell and Dutch Gap Canal. Mustering out June 30 1865. Please Note, I am always, always looking for any original antique shoulder stocks for Colt Army, Navy and Dragoon Revolvers and will pay top dollar for them.