This Winchester manufactured small top hat style butt stock nut measures 10/16" across, is for the model 190 semi-auto rimfire rifle and is in very good condition with light wear. (file photo)

Note: Winchester model 190 semi-auto rimfire rifles with the following serial numbers have been observed with this part:

No Prefix:

B Prefix: B1060577, B1123247, B1334526, B1707786, B1746789, B1850799, B1852446, B2075043, B2109865 & B2150896