The Colt Model 1877 revolvers were Colt's first double action revolvers and were designed by William Mason who also helped design the Single Action Army. Like the latter, these revolvers were popular with gun slingers in the Old West, and remained popular into the early 20th century. Manufactured in 1909, the top of the barrel has the standard two-line address and the left is marked with "COLT D.A. 38". The three-line patent dates marking is on the left of the frame followed by the circled Rampant Colt. The matching serial number is visible on the frame and trigger guard, and the assembly number "801" is inside the loading gate. The period replaced back strap is numbered "165768". It has standard features and is fitted with a pair of checkered grips.