Winchester Model 61 Pump Action .22LR Takedown Rifle. Low Serial Number. The left side of the barrel is marked “-WINCHESTER / PROOF STEEL”-, “MODEL 61”, -“WINCHESTER / -TRADE MARK-”- and “.22 S.L. OR L.R.-”. The top-rear of the barrel and the top-front of the receiver each have an ovalled “WP” proof. The serial number is marked on the bottom-front of the receiver and trigger guard assemblies. The right side of the barrel is marked “MADE IN U.S.A. WINCHESTER REPEATING ARMS CO. / NEW HAVEN, CONN.——PATENTS PENDING-”. The Winchester Model 61 rifle was introduced in 1932, and was a hammerless design with a tubular magazine. It was actually released after the Model 62, which like the previous Models 1890 and 1906 also had a hammer. The Model 61 was Winchester’s answer to the hammerless Remington and Marlin rifles being produced. Round and octagon barrels were available in .22 S, L and Long Rifle, and the octagon barrels were also available in .22 WRF. After WWII, the octagon barrels were discontinued and the .22 WRF chambering was offered in round barrels. This one is chambered for .22 S. L. or LR. Caliber/ Gauge: .22 LR; Serial Number: 151975