This screw which passes through the forestock into the barrel escutcheon (nut). It is an original Winchester part.
Excellent condition screws are used with minimal tool marks.
Very Good condition screws are used with perfect threads, but may have very minor tool marks and/or bluing wear, but no rust or other damage.
Reproduction screws are new and are dimensionally identical to the original Winchester screw, but do not have the same polished metal of finish as the original screws.