Manufactured from 1874-1879 with standard features, the two-line address on top of the barrel, "COLT NEW 41" in an etched panel on the left, and British proofs on the bottom of the barrel and on the cylinder. The caliber marking is also on the left of the frame, and the matching serial number is on the left of the grip frame under the grip and partially ("600") on the rear face of the cylinder. The loading gate and right of the grip frame are numbered "855", and the bottom of the left grip panel is stamped "1855". Includes a hardwood case with Colt London Agency interior label, cleaning rod, and four .41 CF cartridges.