I know I am years late to this discussion, just registered. I believe this commemorative coin was made by the U.S. Historic Providence Mint(H.P.M.) I have one numbered 654/5000 also with H.P.M. Which is made of Solid Bronze. I can not find much about these. I would like to know when these were made/the cost at that time ? and when the company went out of business ?. Here are a few pictures of the specimen I now have.