www.925-1000.com

I've searched this every way I can think of. 18 was the UTA code for Packard's, but that hasn't helped much. The piece of silver the mark is on looks a bit like a repair overlay, but why the fancy stamp if that is the case? Head scratcher. https://www.925-1000.com/pics/Ximg.jpg https://www.925-1000....

Yes, Zuni. Lolita Nacitacio

I think that is the hallmark used by Reuben Rose, an Anglo who taught taught art at Santa Fe HS. This is in his style.