Navajo Silver/Turquoise Shadow Box Earrings - who is "WWW" or "MMM"?

I bought these earrings in the 1970s in a small boutique in Rantoul, Illinois. I have not had any luck finding out the name of the silversmith.

Have you had any luck tracking down the maker? I stumbled across a ring today, obviously the same design and maker, and have had no luck finding info either!