Vtg Swank Hickok bowling Paul name cufflinks

vintage swank monogrammed Paul in gold tone over silver tone oval cufflink. plus gold tone bowling pin and ball square shaped cufflinks. I don't know what kind of metal these are. They may have scuffs due to being vintage. No major apparent damage. The pillbox isn't included. I think the bowling cufflinks is branded by Hickok, but there's no engraving on it so I wouldn't count on it. The greenish barnicle like residue attached on the cufflinks are like that of vintage items found from the titanic.