It's going to be hard without the date or assayers initials , most cobs are missing these anyways . At least that's what I came up with in trying to ID some a friend had . https://images.search.yahoo.com/yhs...=yhs-mozilla-001&hspart=mozilla&hsimp=yhs-001
You can ID by the shield most aren't dated it also helps to have assayers initials to nail down the date. The cross also can be a clue to dating. I don't have my references handy but will look it up and see if I can ID the king and date. Can you post the shield right side up..?
Pat, I agree with Paddy 54 regarding ID based on the shield. Try the website that I've linked. It provides some good background in addition to pictures. http://www.coins.nd.edu/ColCoin/ColCoinText/Sp-Cobs.1.html
If I could put my hands on my reference I tell you, it's around here somewhere .....just need to find it.
ok I found the book , yes it is Greek cross 1571-1652 Potosi & Early Lima, but it's Philip the lll 1598-1621