Hooray for posting pictures and I'm joining in on the idea that is simply a mass produced 1970s cheater top for set dressing and not one made by Ellen Walton, or anyone by hand. That we as quilters may not be so excited does not mean that there aren't Walton fans out there who would be just thrilled by the discovery!
The Bicentennial and the 1970s were an interesting period in quilting, it's when I started just before what we now call the "rotary revolution". The Bicentennial and the hippies both had movements about handcrafting in general as well as quilting and embroidery and other such things were also popular.
There was a bit of controversy with the Smithsonian having "American" quilts made in China...
https://worldquilts.quiltstudy.org/a...iancontroversy
Other controversies including designers using quilts to turn them into clothing.