identification help

[FRosenquist]

Please help me out. Which ERIE series would you guess this is? I've looked very carefully for a makers mark or dots and just don't see any.

Any guesses?
Also what is a skillet like this worth?

DSC_0012 by Frank Rosenquist, on Flickr

 

[Doug D.]

2nd series if the pitting has obliterated just a maker's mark; 3rd series if a p/n.