Just thought I would add that there are several Guerro’s in the Barton Wright book on Hallmarks of the Southwest. Couldn’t find a Chester, but found Amy, Flora, Frank, Fred, Fred Jr., Juan, Phillip, and Tony Guerro. Some are specifically noted as Navajo. Some stamp with Navajo. All seem to be from the New Mexico region, including: Canyoncito, Alamo, Puertocito, and Los Lunas. I’m guessing that silversmithing would be a family trade.
I wondered if the turquoise could be Bisbee, but I’m sure that Jason is much better versed than I am on kinds of turquoise. It is both lovely turquoise and lovely silverwork!
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