This is a featherweight aluminum floor plate from a Winchester Model 70 rifle. The finish appears original in excellent condition.
Bluing - 90% - The finish is mostly dark with a few superficial scratches and scuffs to the finish. Factory featherweight bottom metal came in many shades of black/gray. This piece is quite dark black.
Metal - The metal is in very good condition with no significant damage. Light scratches penetrate the finish.
We use the NRA Modern Gun Condition Standards Grading System for grading part conditions. You can read about it HERE