Thats a super cool find. Was it lead filled? If so it looks like someone may have melted to lead from the back of it. I've never seen a buckle like that with the picture of a lacrosse player on it....Congrats
I saw the name of a couple of professional metal men listed on here not long ago. Their work looks like a new buckle. I was amazed. Yes, I'm sure they had special equipment to work with. It would probably be too expensive unless it was a collector piece worth a lot of money. Monty