This Colt Fourth Model 1851 Navy revolver was manufactured in 1866. The revolver has the Colt commercial blue finish on the barrel and cylinder with color casehardened loading lever, frame and hammer and silver plated brass trigger guard and back strap. The one-piece walnut grip has a highly polished piano finish. The revolver has the late Fourth Model features, which include large oval trigger guard, capping channel in the recoil shield cut-out and thick loading lever latch. The hammer spur has bordered knurling and the barrel has a brass cone-shaped front sight. The top barrel flat is roll stamped with the one-line legend "-ADDRESS COL. SAML COLT NEW-YORK U.S. AMERICA-". "COLTS/PATENT" is stamped in two lines on the left side of the frame. "36 CAL" is stamped on the left shoulder of the trigger guard. The cylinder is roll engraved with the Texas Navy battle scene and "COLTS PATENT No." "ENGAGED 16 MAY 1843" is roll stamped on the leading edge of the cylinder. The full serial number "194679" is stamped on the bottom of the barrel lug, frame, trigger guard, and back strap. The partial serial number "4679" is stamped on the cylinder. The "7" on the cylinder serial number is a factory over-stamp on the serial number "4649" but is an original factory correction. The loading lever is, correctly, not serial numbered. All of the visible serial numbers match. After the Civil War the Model 1851 Navy remained a popular Colt revolver and production continued until 1873 at serial number 215348.