This coin has been in our family for over 70 years. I have seen hundreds of these coins on line but, I have never seen one like this. Do you have any thoughts on where this coin may have come from? Thank you ... Tony
It's a US Columbian Half Dollar minted to sponsor the World's Colombian Exposition held in Chicago in 1893 aka Chicago World's Fair. It appears someone has painted the reverse side and put it in a custom case.
Painting coins is something I did not realize is a thing. I can't say who painted your coin, but perhaps you can contact some enthusiasts.