Anyone know who the VV hallmark is from?

I purchased three pieces at an estate sale. I believe they are HOPI silver overlaid. The cuff bracelet and the pendant both have the hallmark “VV” underlined and the ring has a hallmark of KB. I can not find out anything about either hallmark. Thanks in advance.

Yes, this one is difficult. The overlay work doesn’t look like it is Hopi, but Navajo made. The W is confusing, I have seen a similar one with Woodard’s but their is a stamp not an etching. Do you have any information on the age of these pieces? Thanks for sharing.