Sterling and Turquoise Cuff Identification

[yahtaa]

Got this piece from a client today. Couldn't identify the makers mark from my usual sources. Anyone have any ideas?

[Aguest]

Certainly a native american pictograph hallmark, but which one exactly I have not found an exact match. Seems Navajo most likely, with a slight chance of belonging to Hopi. I have heard the greenish-blue turquoise described as "Royston," but I can't say for sure which mine the turquoise is from.

I have searched through the pictograph hallmarks that have been collected in various sources and have not found it yet.