This used Colt US Army Model 1917 revolver fires the .45acp round. It has a 5 1/2" barrel with an overall blued finish. This 6 shot revolver has wood grips and a lanyard loop. The Colt symbol is pretty clear on the left side of the frame. Also on the left side of the frame, near the hammer, there is a small symbol that looks like an outline of perhaps a bird, then "S20". On the left side of the barrel is:"COLT D.A.45"