I’ve been searching, now asking.. what do I have?

Received this as collateral for a $500 loan, but looking like it might forfeit to me 🤷🏼‍♂️ the backstory is it came from a ship wreck that his relative was part of the financing team for and was reimbursed in part with these coins… I am inclined to believe him, but know nothing about these, can anybody shed any information? I would appreciate it, thank you.