This York County rear sight is modeled after one by George Shreyer. It will make a excellent choice for your next longrifle. Made in the U.S.A. from wax cast steel.
Cut your dovetail .050" deep, not more than .062" deep, .750" long, by .578" wide for 1" octagon, or file trim the edges to fit a 15/16" barrel.
If set into an .050" dovetail, the sight blade will stand about .350" above the top flat of the barrel.