Thank you for your help guys.
The skillet looks rough. Lots of rusty areas and pitting on the inside. Grease and grime on the outside. But, I have never seen one that is shiny-ish on the inside. I can only guess that someone started to clean it up. It looks like it could become a usable skillet.
It will become a great air rifle target backstop if all goes wrong in the clean up. That was my first thought anyway.
