This Remington manufactured stock bolt washer is for the model 12 slide action rimfire rifle and is in very good condition with a few specks of surface rust.  (file photo)

Note: Remington model 12 takedown slide action rimfire rifles with the following serial numbers have been observed with this part: 351695

12-A: 3867, 100823, 570191 & 802984

12-C: 229853, 303506, 408616, 409187, 500140, 597770, 600364, 607712, 640490, 663586 & 722004

12-CS: 225240