This is a standard steel floor plate from a Winchester Model 70 rifle.
Bluing - 85% - This floor plate appears to have factory bluing, though it's also possible that it's also an older refinish. It has little edgewear or fading. There are a few small scratches and a hint of freckling, but no notable damage.
Metal - The metal is in excellent condition with no notable damage.
We use the NRA Modern Gun Condition Standards Grading System for grading part conditions. You can read about it HERE