Hi Sarah,

Thank you for contacting Mearto with your appraisal inquiry.
These prints were made prior to Warhol's (1928 - 1987) and he did sign some but the ones that are signed "in the plate" rather than outside the image are ones that were reproduced after his death. For reference, you might check out this link to similar examples that have sold at auction (https://www.liveauctioneers.com/search/?keyword=warhol%20diamond%20dust%20shoes%20print&page=1&pageSize=24&sort=-relevance&status=archive).
Based on the photos and information provided, and subject to examination, this is:

An authorized Andy Warhol Foundation print
"Diamond Dust Shoes", early 1980s
"signed" lower right in the plate, the verso bearing Art Gallery NY stamp and Andy Warhol Foundation for the Arts stamp
11 3/4 by 8 1/4 inches
CONDITION: unframed
PROVENANCE: acquired from a collector/hoarder
$50-75*
*represents a fair-market value for auction purposes; retail or asking price may vary.

Please let us know if you have additional items to appraise, and thank you again for using Mearto.