You have me beat. I do have a “piece of eight” that was minted in Potosi, Bolivia. I don’t remember the date as I have it stashed away. I bought maybe 45 years ago.
We have some other pieces that hubby found while diving off the coast here in California we sent them to a numismatist and he verified they were real. After research they determined they were from a ghost ship, a ship that disappeared but no one really knew where.