Colt Model 1877 Thunderer, .41 Colt cal. double action revolver.   Serial #163134, mfg. 1907 .  Very good condition. 6” barrel has an excellent shiny bore. Sharp address markings. Blue finish is 90% with a mark on the top of the barrel and some cylinder edgewear.  Frame has 80% remaining case colors. All matching numbers on barrel and frame.  Colt hard rubber grips are excellent.  Double action works smoothly – a great example!  C&R OK. Gunrunner West item.