This Winchester manufactured mainspring strain screw is for the model 1890 slide action rimfire rifle and is in very good condition exhibiting a grayish brown patina with light wear. (file photo)

Note: Winchester model 1890 slide action rimfire rifles with the following calibers and serial numbers have been observed with this part: 191868, 206791 & 637738

22 Short: 307126, 392480 & 644101

22 Long: 790566

22 W.R.F.: 261432 & 292176