Shipwreck reveals precious coins, rare pewter artifacts to salvors at Punta Cana, Dominican Republic. The most important shipwreck of its kind dating from the 1500s was recently discovered by Anchor Research & Salvage SRL. According to noted pewter expert Martin Roberts "Pewter finds from the 2012 diving season continue to support present hypotheses on date and origin while also surprising collectors and challenging orthodox knowledge of the mid-16th Century pewter trade. Recovery and preservation efforts are ongoing, according to Robert H.