Manufactured in 1931. This carbine features a pinned blade front sight and rear leaf sight on a barrel marked with the Winchester legend on the left side. The Winchester factory oval proof is stamped on top of the barrel and receiver at the breech. The top of the barrel behind the rear sight is marked "S.F.P.D." (the mark of the San Francisco, California Police Department). All blue finish with a smooth walnut forearm and straight grip stock with a smooth carbine style buttplate.