11/26 Report - New Pirate Museum & Pillar Dollars

Part of a Coin in Concretion.Here is an image of part of a copper coin found in concretion in the Caribbean. It was found by David S. who would like to identify the coin and would be happy to receive any help in doing that.This was found in an area with other old shipwreck items including a brass spike and piece of an old hand-forged chain.There seems to be block letters on the edge of the coin.