Antique Navajo Hubbell 12mm and Silver Bench Bead 6mm Necklace Super RARE!!

This is a once-in-a-lifetime find!!! I got my hot little hands on what I'm as sure as I can be without a professional appraisal is a genuine Hubbell bead and Navajo bench bead necklace. It is strung on the old style cord. You can see in the pictures that the bench beads are handmade silver.
For a bit of background, Hubbell beads were used in place of turquoise on the Hubbell Trading Post. They imported the glass beads that looked like turquoise from Czechoslovakia, and the Navajo added them to their silver jewelry. These beads and necklace were most likely made between 1915 and 1920, making this glorious necklace over a hundred years old.
It is very unusual to find a necklace like this outside of a museum that also features Navajo silversmithing. It is in wonderful condition. I had to give it a very gentle bath in warm water to clean off some gunk, but there are two bench beads that didn't lose their tarnish (see pics). Not signed but the style is unmistakable.