I’ve had these bracelets for years and the only mark that looks remotely similar is for Edgar Miller Hovalo on page 78 of Margaret Nickleson Wright’s Hopi Silver book. But I’ve seen a lot of antique and vintage Hopi jewelry and these strike me as not that old.
This is the hallmark for Edgar Miller Hovalo in Billie Hougart’s 5th edition, and it to me looks quite a bit different (sorry so dark - not great light right now).
I tried to do a quick search for his work online to compare the hallmarks, but I didn’t have much luck.
You might try contacting the Hopi Cultural Center gift shop on second Mesa to see if they have any idea; many years ago they helped me with info on a cuff.
If you scroll down in the link you will find the gift shop info.
Before comment on the hallmarks, what stands out to me is that the saw work looks rushed and a bit uneven. This is more typical of production work rather than the careful work of a well known Hopi artist. The hallmarks themselves are easy to create (or forge), and don’t seem to fully match. While attractive, I would not characterize these as Hopi work, or the work of a particular artist without solid provenance.