Veteran and dedicated collectors use reference books...LA-based dealer Doris Raymond discusses her Mexican silver jewelry-collecting history.

https://www.youtube.com/watch?v=m9aKFXTyxfo&feature=share

I had a great time discussing hallmarks and my new book, the 4th edition of Native American and Southwestern Silver Hallmarks, with Mark Sublette at his wonderful shop in Tucson, AZ, Medicine Man Gallery...

Between 1946 and the late1950s, participating members of the United Indian Traders Association (UITA) marked Native American silver jewelry, hollowware and flatware sold in their shops and trading posts with the UITA stamp to identify those items to customers as authentic, hand-made and high quality pieces.