I don’t even find a DW to compare styles of work, except for Doris and Warren Ondelacy which this is not. You look to have a boom piece, something from the 1970s and 80s when lots of people are making jewelry part-time to fill the demand. Initial hallmark is going to be difficult. We do know this is a Navajo style so you might do some research in Navajo W last names, and eliminate Zuni and Hopi.
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I just stumbled upon this looking for the exact same ID on a ring. Hopefully someone finds something!