Navajo Sand Painting "Big Thunder" Thunderbird Original Art Framed and Signed

Vintage Navajo sand painting artwork, with original frame. It is titled "Big Thunder" and signed on the back. The painting depicts a traditional image of a thunderbird. It still has the tags - the original price tag has the Fred Harvey logo. Likely from the 60s or 70s. Good vintage condition, there are some wear and scuffs around the frame and some light scuffs on the surface of the painting itself. 13 1/4" square