Who is the manufacturer of my cast iron pan?

I got this old cast iron pan from my father-in-law. The back is marked in all capitals 9 3/4 INCH SKILLET. Under that is a lone capital H. Another capital H is on the underside of the handle and a number 7 on top of the handle. It looks pretty old with a nice black color, 2 inch sides with a pour spout on two sides, short loop handle. Any help would be appreciated. Thanks.