Ceci nest pas une loupe.
His paintings sell for between $50-$100.
I don’t know how much a sculpture would be worth, but that’s the value of the lithograph “Arabs”.
An etching in soap stone might be the source of the prints. Make an image of the stone, reverse the color and flip it…and see if it matches prints you can find. If they do…you found the stone on which the prints were created.
Just a thought.