This is the original "Piece of Eight" (peso de ocho) coin,
famous from many pirate storys. (also known as "Spanish Dollar")
After photographs of an original coin minted in Mexico under Philip IV of Spain, 1650, it looks "worn", like a coin that has been in circulation some time.
Pieces of eitght were of silver, so (if you don't can or want to afford a print in silver) I'd recoomend to order one model in white plastic, make a mold and cast copies from pewter, which looks very much like the original.