This is a very large Griswold iron skillet. It is the number 14 with fire ring bottom. The longest dimension, including the handle is about 21 1/2 inches. The diameter of the inside top is about 15 inches where as the diameter of the inside bottom is about 14 inches.
See photos for best idea of condition. The item "Griswold #14 Iron Skillet Erie PA w Heat Ring PN 718" is in sale since Monday, August 29, 2016. This item is in the category "Collectibles\Kitchen & Home\Kitchenware\Cookware\Cast Iron". The seller is "jannestee" and is located in Dayton, Ohio. This item can be shipped to United States, to Canada, to United Kingdom, DK, RO, SK, BG, CZ, FI, HU, LV, LT, MT, EE, to Australia, GR, PT, CY, SI, to Japan, to China, SE, KR, ID, to Taiwan, TH, to Belgium, to France, to Hong Kong, to Ireland, to Netherlands, PL, to Spain, to Italy, to Germany, to Austria, RU, IL, to Mexico, to New Zealand, SG, to Switzerland, NO, SA, UA, AE, QA, KW, BH, HR, MY, CL, CO, CR, PA, TT, GT, HN, JM, BB, BD, BM, BN, BO, EC, EG, GF, GG, GI, GP, IS, JE, JO, KH, KY, LI, LK, LU, MC, MO, MQ, MV, NI, OM, PE, PK, PY, RE.