This is a standard steel floor plate from a Winchester Model 70 rifle.
Bluing - 85% - This floor plate has factory bluing in very good condition. There's hardly any fading or edgewear, but there is some freckling and light pitting. It also appears this piece was buffed too hard, and light surface scratches can be seen. Please see photos. Still, it's a very decent piece.
Metal - The metal is in very good condition, with a small spot of pitting but no other damage.
We use the NRA Modern Gun Condition Standards Grading System for grading part conditions. You can read about it HERE