Can this mirror be refurbished?

If rechroming proves to be impractical, you may want to contact @CudaChick1968 and get her recommendations for surface prep- I have seen some powdercoat finishes that are amazingly close to chrome. Fill the chip with JB Weld and file to shape, address the crazing and pits to her recommendations, and send it off to her...?

I appreciate the shout out but prefer to do any repairs myself because few are intimately familiar with the requirements of powder coating.

JB has its uses but usually comes with thousands of air bubble aftereffects if it's not mixed properly.

Pot metal is its own beast when it comes to heating it up. Impurities are expected; it may even have pewter in it with a 140 degree melting point that will destroy the part if it gets too hot. Generally, the thicker the piece the more likely it also had air trapped in it when the piece was formed.

I never encourage anyone to get pot metal coated because the results are too unpredictable, and most especially not experimenting on rare pieces. All I can do is present the facts and allow the customer to make their own decision.

Trim restoration is tedious and time consuming (i.e., $$$$$) no matter what substrate you're working on. Pot metal takes a pro, and an old experienced chrome shop is where I'd start if that was my mirror.