You my friend have found the Rolls Royce of cast iron !
A side note....should you want to use it as a camp oven simply add a gas stove grate under it to allow room for the coals and a short length of heavy chain around the top to contain the top coals and you have it converted to a camping dutch oven!
Here is Wimperdink's version of the above idea.....

here is a little history stolen from Wickapedia......
Wapak Founded: 1903
The Wapak Hollow Ware company was named after its hometown of Wapakoneta, Ohio, where it produced several lines of "thin wall" (lightweight manufacture) cast iron skillets. Information about this company is scarce but bankruptcy in 1926 is the reason listed in the Auglaize County records for Wapak's disappearance. This line of cook wear does not have the indian head symbols on it. The oldest cast iron cookware was in fact called Indean Head Wapak and had been making cast iron skillets and cook ware since the late 1700's