My cooking partner in BBQ competitions and I have started collecting cast iron, and your information here has been invaluable. He found a skillet that has the characteristics of BSR based on the handle. It has what looks like a steam inset ring, or something around the top. I have yet to see anything mentioned or pictures of anything like this up to this point. It has a patent # on the bottom. 2199887. Any help would be appreciated. Thanks.