The bezels are hand made, so it probably predates the 70s. The cabachons are derived from small nuggets and hand shaped. The pattern is an overall squash blossom motif.
Im guessing from the matrix in the turquoise that it is from either the Kingman or Sleeping Beauty mines.
The setting is all silver, possibly coin silver 90%, and is done in the Navajo style. It looks copper like because of the red background.
Twisted wire is not a Zuni thing. The hallmark of Zuni is precise cut inlay stone.