This is a standard steel floor plate from a Winchester Model 70 rifle. It appears to have been refinished, though not in the pre64win shop.
Bluing - Refinished. The bluing on this floor plate is soft-black in color with a silky texture. The look is similar to rust-bluing, but we cannot confirm what the finish is. There are no scratches, edgewear or fading to the finish. There are a few areas of slight color inconsistency.
Metal - The metal is in very good condition, with some small scratches and dings that remain visible underneath the new finish.
We use the NRA Modern Gun Condition Standards Grading System for grading part conditions. You can read about it HERE