My Aunt Doris's favorite 1960's silver Ram pin with pink rhinestones

I always admired this Ram pin that my Aunt Doris wore often in the 1960's. She was an Aries the Ram and this was her favorite pin to wear on a dress for work. It has Great E stamped on the back of it. Does that stand for Eisenberg? If anyone knows could you please tell me? My daughters aren't fond of jewelry, like I am, but they really like this pin. Anyone else out there please make comments.