This is a Super Grade swivel base screw for the front swivel base.
Original parts are factory Winchester pieces in excellent condition.
Reproduction parts are new with an external dimension identical to the original Winchester part. The thread is different, however. These reproduction swivel base screws will only work with the reproduction swivel base stock nut foundHERE
We use the NRA Modern Gun Condition Standards Grading System for grading part conditions. You can read about itHERE