WOOL SOAP RARE DESIGN BUTTON.
7/8". Early 1900s issue more frequently seen as a 7/8" w/product name. This one has no text and depicts pair of young children, one in knee-length nightshirt and the other in a nightshirt that has shrunken to reveal the child's behind because mother failed to use the product. Rare and Exc.
Pictures (click images to zoom in)