This Marlin manufactured rear sight assembly measures  approx. .350" high, has a .095" wide elevator groove and includes a .079" wide elevator. This rear sight assembly  is for the Glenfield model 25G bolt action rimfire rifle and is in very good condition with light wear. (file photo)

Note: Marlin Glenfield model 25 rimfire rifles with the following year/serial number have been observed with this part: