Hello everyone..I recently started buying cast iron pans and keeping a few and selling a few...This recent purchase is a large skillet with lid and I was wondering if anyone could shed some light on the manufacture...??This has a fire ring on bottom that is broken at 9,12,and 3 oclock and the only markings are the number 14 on the lid and an L circled on the bottom with U.S also circled..hope these photos help and thanks for any info.