Well I know what it is so I kinda buffaloed you because I have a lot of who done its on here!
This is a sad iron heater that came with 3 Mrs. Potts sad irons that I see a ton of around here (that photo will be coming soon!).
I know that the foundry in Dubuque, Iowa made a lot of Mrs. Potts sad iron trivets so it would only make sense that they made irons as well. I see a ton of the Dubuque trivets around here so I might be inclined to believe this was a piece made by them?? Only markings are PAT. APL'D FOR and the number 11. or 77.??