Two long modernist brass necklaces

Two modernist brass necklaces from, I guess, the 1970s. They're long, but also very thin; when not worn or otherwise put on display, they basically fade into nothing. Both have "beads" with decorated surfaces, but the metal used on the second necklace is thicker than the one on the first.

I bought these on separate occasions. They might be from the same source, they might be not -- all I know is they look similar.