This Marble's manufactured Automatic Flexible Joint tang peep sight for the Winchester model 1876 lever action rifle. This near mint peep sight is marked "W3" on the underside of the base indicating the rifle it is for is the above mentioned large frame lever action repeating rifle. This sight is in excellent condition retaining nearly all of its original blue finish and includes the original two piece cardboard box and papers. A great sight to compliment your collectible Winchester rifle.