Vintage Sterling Zeta Tau Alpha Crest Disc Charm Pendant. Back is stamped “Sterling” and “Automade”. Automade is the maker’s mark stamp for Automatic Chain Company which is part of the Speidel jewelry company that started in the United States in 1904. Not sure the exact date of this piece. The charm/pendant is in excellent Vintage condition. Only slight-hardly-noticeable scratches. The back of the disc has a large blank area which is great for engraving initials, initiation d...ate, etc. The. Harm weighs 3 grams and is approximately 19mm or 0.75inch around. I have several vintage sorority/fraternity pieces up for auction. Shipped with USPS First Class.