I picked up this nice little number 4 skillet with heat ring and it is unmarked and I have been trying to identify it, To me the underside of the handle makes me think it is a Wagner, The flat spot where the handle meets the body and the incised number 1 or dash mark in the scooped area where it leads to the body of the skillet, I have a marked number 3 Wagner Ware that has an almost identical handle and has the incised number 1 or dash mark.