The premier maker and designer of animal jewelry from 1903 onward, Gustav Manz did work for many well known jewelry firms in New York, including Tiffany, Cartier, Dreicer, Marcus & Co and Black Starr & Frost. He also worked for Shreve Crump and Low in Boston. Please see this link for a further discussion about the attribution of the elephant ring and to learn a bit more. Thanks! https://eragem.com/news/did-gustav-manz-design-this-18k-gold-cartier-elephant-ring-which-sold-for-13200-at-recent-skinner-auction/