This entry is a redirect page. The mark shown here, together with a few others, belonged to the import and distribution company Toyo Trading Co. (PM&M ID #0208-018) in Fullerton (California, USA). Please check out the linked page for more information.
Many items originally include a warning, either in the form of underglaze text or a sticker, which reads "Not for food use. Article may poison food. For decorative purposes only". Of course, unscrupulous resellers often removed the stickers, endangering unsuspecting customers.