So this has been a tough one to ID. We only had the ZS (or potentially SZ just to throw a curve ball). It looks Southwestern/NA but we could not find a known maker using those initials and that font. There are a few other examples with that mark out there but no one else can ID it either. We believe there is silver content as a scratch acid test yielded a creamy blue color which means less than sterling (.925). Likely around .800 silver give or take based on just the color. See photo. It does have a ding/dent on the top which you can see but doesn?t photograph well. While noticeable, it?s not disruptive really and since silver is so soft, it would make sense. See photos. Very unique bracelet! Will ship USPS with tracking to winning buyer