Manufactured in 1847 at the Whitneyville, Connecticut factory of Eli Whitney, Jr. Colt manufactured 220 pistols marked "A COMPANY No 1" to "A COMPANY No 220". The A Company revolvers were the second group of 220 assembled by Colt. These revolvers were inspected and shipped from Whitneyville to the New York Ordnance Depot on August 6, 1847. The A Company Walker Revolvers arrived at the ordnance depot at Vera Cruz, Mexico on October 22, 1848. Some of the A Company revolvers were part of the 394 revolvers issued to the 1st Regiment, Texas Mounted Volunteers commanded by the former Texas Ranger, Colonel John Coffee Hays. The remainder of the A Company Walker Revolvers were issued to Company C, U.S. Mounted Rifles on November 19, 1847. Both the Texas Mounted Volunteers and the U.S. Mounted Rifles saw action in Mexico during 1847 and 1848. The Texas Mounted Volunteers turned in 191 Walker Colt revolvers when they were mustered out of federal service on May 8, 1848. Only 82 of these revolvers were listed as serviceable. Some of the serviceable revolvers were subsequently issued to the 2nd Dragoon Regiment and federalized Texas Rangers in 1849-50. The U.S. Mounted Rifles served in Oregon and California from 1849-51. Revolver No. 182 is one of 40 A Company Walker Model Revolvers on the list of surviving Walker pistols on pages 79-80 of "The Colt Whitneyville-Walker Pistol" by Lt. Col. Robert D. Whittington. The revolver has the distinctive half octagon nine inch barrel with German silver front sight blade and hinged round tip loading lever secured by a T-shaped spring. The massive six shot cylinder has oval stop slots and a single locking pin in the rear face. The frame has cut-outs at the back for the forward contour of the grip. The trigger and cylinder stop screws do not pass through the right side of the frame. The brass square back trigger guard has a distinctive broad base. The back strap is iron and the one piece black walnut grip has a slim Jim profile. A rectangular silver plate approximately 2 3/4 inches long by 1/4 inch wide is inlaid in the left side of the grip (about half of the plate is missing). The top barrel flat is roll stamped with the legend "ADDRESS SAML COLT NEW-YORK City" in one line reading toward the muzzle. The left side of the barrel lug is roll stamped "A COMPANY No 182" above the wedge slot. The right side of the barrel lug is stamped "1847" above the wedge screw. "A COMPANY No 182" is roll stamped on the lower left side of the frame and on the bottom of the iron back strap. The bottom of the trigger guard is marked: "A COMyNo 182" in tiny letters below the trigger guard screw. The cylinder is stamped "A COM-Y No 150" in tiny letters. The cylinder was almost certainly mismatched in the field. All the other visible serial numbers match. The right side of the loading lever, the bottom of the barrel lug, the bottom of the frame and the back strap are all stamped with three small punch marks. The significance of these marks is unknown. The revolver is accompanied by a Gamma Ray test report dated 9/14/61 that states "Radiograph does not show any welding or repairs on this revolver".