Mart, here is the paperwork from the listing - (Yes I know there are "typos" but I retyped it just as it was typed - with typos!) It states:
"Mexican, Pre-Columbian Artifacts, acquired 1955 through 1959 and cleared for legal export by Dr. Bernal Diaz, director, Museo Nacional, Mexico, D. F.
In 1960 the collection was authenticated by Dr. Gordon M. Eckholm, curator for Meso-America, The American Museum of Natural History.
Some were created before the birth of Christ, most date form about 900AD, all predate the arrival of the Spanish in th early 1500's.
(Handwritten) Thank you for your kindness. 10/10/97 Jesse R. Smith, 99 Liberty St. Bloomfield"