Ava Gardner Film Costume Designer's Original Sketch by Virginia Fisher

I got this From the Estate of a Costume Designer for Hollywood

Pretty certain that it is an original (its very apparent that the pencil signature that is exposed from the broken glass in the lower right corner is not a copy, original pencil strokes.

The internet is flooded with these ava gardner costume sketches but there all prints. I have not been able to find another original, so I have no idea what it's worth is.

any info or thought would be great