So, this is a concho as in one panel from a belt, with loop on the back? How big are we talking about? Can we see a pic of the reverse?
This thread, post 4, shows the hallmark as unknown in Art Amerindien, and it doesn’t appear in Hougart’s.
https://forum.turquoisepeople.com/t/can-someone-help-me-identify-this-piece/7034.
Stylistically you can rule out Zuni Tsabetsaye, nor does it resemble online images of Terry Charlie’s silverwork, which is traditional and not figural.
I am not sure of its origin. The imagery seems mixed up, between (I guess) Plains figures and SW buttes and flora–? Maybe just creative license.