I purchased three pieces at an estate sale. I believe they are HOPI silver overlaid. The cuff bracelet and the pendant both have the same hallmark and the ring has a hallmark. I can not find out anything about either hallmark. Thanks in advance.
It’s not rare that there are unknown marking because they are very old.
There were many silversmith and not all of them are famous.
All of these pieces are likely sterling silver. Try to get them tested. First with a magnet then move to other methods like acid