Any information on W. Begay?

I have a zuni-style needlepoint necklace and earrings which are stamped W. BEGAY. The information from the seller was that the set was purchased in the late 60’s or early 70’s during a trip to the SW. Besides wanting to know a little more about the maker, I would like to replace the side chain (which does not appear to be silver and is not in the correct style) and bring the necklace back to original condition. Attaching a picture of the necklace. Any thoughts on a suitable chain and recommendations on a reliable repairer, also information on the silversmith would be much appreciated. Barbara