https://en.wikipedia.org/wiki/Griswold_Manufacturing
Griswold Manufacturing (/ ˈ ɡ r ɪ z w ɔː l d,-w əl d /) was an American manufacturer of cast iron kitchen products founded in Erie, Pennsylvania, in business from 1865 through 1957.For many years the company had a world-wide reputation for high-quality cast-iron cookware.Today, Griswold pieces are collector's items.