I bought a crudded up one of these years ago, certain from the handle and font of the 8 that I had a Griswold. Came out of the lye tank looking just like this. It's someone (unknown) using an actual Griswold skillet as the basis for a pattern. Mine is very bottom-heavy, I assume from the markings made by the pattern skillet on the sand mold surface being scraped off before casting, and taking some extra sand with it. On yours, I think there's a faint ghost of a large block Griswold logo.