I have an unmarked cast iron pan stamped 11 3/4 INCH SKILLET on the back. There’s one on eBay in much better condition that looks very similar. Listing says Griswold – asking $160. I’m not so sure about the make being Griswold. From what I’ve found online, the font, raised inverted triangle on the handle and “S” stamps looks more like Wagner Ware.
Skillet still works great. Been using it all week!