1570 AD sounds like a world coin, so *we're not allowed to comment* ... just jokes ... => if that thing is authentic, then I would definitely pull the trigger!! (it is very, very cool) ... wow, I love the obverse & reverse (again, that's very cool)
=> well, that sounds good (ummm curious, does the seller also have a lifetime refund-policy to go with his promised-guarantee?) ... either way, $18 isn't a huge gamble, my friend (I'm sure the coin is a total winner) ... it is very cool (congrats)