The story of this bracelet is unknown. That is part of the intrigue. It comes in a box on a bed of antique cotton from B. Altman & Co., East Orange, New York, White Plains, a luxury department store established in 1865 in New York City. It came from my mother's side of the family, and from her father's side, Erdmans and Adams before that. Constance Erdman was on the New York Social Register before the crash of 1929, and this would have likely belonged to her at one time. It is silver, but I do not know exactly what it is made of. And it may not be Aztec, it may be Mayan or of some other culture. 

ANTIQUE Aztec Bracelet: B. Altman & Co., New York