This is a .31 caliber, 3rd Model Bacon Revolver with a 5 inch barrel.  These guns were manufactured between 1858 and 1867 and I suspect this one is about 1864-1865 production but am not entirely certain.  It has matching serial numbers and mechanically functions fine, nice and tight.  It has two piece grips which are showing numerous dents and dings yet retains a significant amount of original finish.  The cylinder scene is complete and visible.  The barrel markings are present but extremely faint.  You need a magnifying glass to make it out.  The gun is relatively smooth and cleaned to bright with a significant dent/pit to the right side of the front sight near the end of the barrel.  There were probably less than a thousand of these guns made with the solid round cylinder and cylinder scene.  A very good condition gun at a reasonable price.  SOLD!!