This factory manufactured butt stock washer is for the Sears, Roebuck and Co. model 3T No. 273.2390 semi-auto rimfire rifle which uses the butt stock nut which lacks the top hat style rim. This washer is in very good condition with light wear. (file photo)

Note: Sears, Roebuck & Co. model 3T semi-auto rimfire rifles with the following serial numbers have been observed with this part: 13624, 14662, 74160 & 115165