This is an aluminum Winchester Model 70 Pre 64 Floor Plate for a Super Grade Featherweight rifle. It is in new/perfect condition.
This item was acquired from a reputable parts dealer as an original Winchester part. Winchester only made 921 Super Grade Featherweight rifles, making parts for these rifles exceedingly rare. It also makes it very difficult to examine original parts in order to make a direct comparison. We believe this is a genuine, late-production (post-1957) part. The dashes on either side of the "SUPER GRADE" are straight and not teardrop shaped. This is consistent with the floor plate stamping on late-production Super Grade and African rifles.
We use the NRA Modern Gun Condition Standards Grading System for grading part conditions. You can read about it HERE