If we are to go by the Red Book, a Blacklock skillet would have an outside heat ring. But then we would also have to believe that, after the Blacklock burned down, and Joseph Lodge started Lodge Mfg. Co., he immediately switched to inset heat rings, as there are no known Lodge skillets with outside heat rings. There is apparently no historical documentation that proves Blacklock moved to inset heat rings before its demise. Given the timeframe, however, one would tend to think that a Blacklock skillet, as well as the first Lodges, must have had the larger pour spouts, unlike this example.