Absolutely authentic from the estate of a Santa Fe super collector who purchased, and personally removed, this set from a vintage Santa Fe Railroad car which was being scrapped many years ago. These figures were originally housed in a circa 1940's Santa Fe El Capitan dining car. This is a set of three metal Zuni figures attached to each other, another single metal Zuni figure and also a separate Thunderbird figure. The figures are a cast metal alloy, the Thunderbird retains a glossy finish, while the Zuni figures are in a matte finish.
There are two screw holes on the bottom of the Zuni figures. The Thunderbird is one piece, un-drilled, and both would have sat along a track.
These are absolutely authentic and extremely hard to find. For illustrative purposes only, the last image shows how the pieces were displayed in a railcar.

In excellent Vintage condition.