I live on Canada's west coast and have a few pieces of vintage Canadian cast iron cookware made between ~1930 and the mid-1960's. I have never come across vintage cast iron cookware that was manufactured before this time frame, and although there's lots of Wagner Ware pieces out here, there's very few Griswold pieces. This week I picked up a skillet marked with "ERIE" for ~$20USD that I don't think has much value beyond cooking my breakfast - but I'm hopeful that the experts on this forum can give me a sense of how it might have been created. 
