This Stevens manufactured second variation trigger spring screw with a small flat head is for the Favorite single shot falling block rimfire rifle and is in very good condition exhibiting a grayish brown patina with slot wear. (file photo)

Note: this part is commonly found on Stevens Favorite single shot rimfire rifles with 1st thru 8th variation receivers. The lowest serial number we have found on a 1st variation receiver with this part is 56740.