On the left is a rare and beautiful dark cobalt peacock CD 162 H.G.Co. compared to a much more common dark cobalt Hemingray-19 on the right. If I remember correctly only five of the cobalt peacock CD 162 H.G.Co.'s are known and they were all found in Michigan. View original for a more detailed view http://www.insulators.info/pictures/?op=original&id=497732978