This is an unmarked number five cast iron skillet. It is labelled 8 Inch Skillet, and has a small letter H. It is likely a Wagner or Griswold or Lodge that was left un-branded for certain markets. It has no county of origin stamp which indicates it was made prior to 1960. 

I bought it in rough shape and used electrolysis to clean it. I applied three coats of sunflower oil to season the pan. I then cooked an egg on it and ate it. 

It has a smooth cooking surface unlike modern cast iron. It also has various dings and dents from age