I know this post is resolved, but... I found three of those on Indian Shores Beach, about a month ago... They appear to be 1677 Bolivian 8 Reale Cobs, but they are exactly the same size, shape, etc. Two were encrusted in about an inch of sand and salt, until I broke them open (and also broke the FAKE coins) to see what I'd found. Bummer that they are fakes, but on a positive note, the Legend works well on the beach and I found them!