Metal Bust of Paul Revere by Redford Foundry

This item is a metal bust that is in good condition as far as detail but has what appears to be rust or corrosion all over it. The metal is light which makes me think most of the metal has deteriorated over the years. You can read paul revere at the base, you can make out all details regarding paul revere's face, hat, shirt etc, also you can read the makers mark (Redford Foundry) and what I believe are the foundry workers logo on the back of the bust. Curious of its value and to learn more about the Redford Foundry which I cannot seem to get any history on. Thank you.

Fair