The coin was salvaged from the wrecksite of the Concepcion which sank in July, 1641 at the Silver Shoals, off the DominicanRepublic. There is an information sheet about the Concepcion, but I do not have a Certificate of Authenticity for this coin. The item "Spanish Mexico Spanish Colonial 8 Reales Cob Coin 1630-1641" is in sale since Monday, December 30, 2019. This item is in the category "Coins & Paper Money\Coins\ World\South America\Bolivia".The seller is "waramaug11" and is located in New York, New York. This item can be shipped worldwide.