Help ID'ing Wagner Sidney, without the "O"??

[Kevin Eng]

Picked this #7 Wagner Sidney. There's no "O" from when they moved to Ohio, so I'm guessing either it's pre-1910 or...a mistake from the foundry??? Any assistance would be appreciated. I can get more pics after it's done being stripped and seasoned.

 

[Doug D.]

Wagner was founded in and always operated in Ohio. In the case of this pan , the "O.", always located below the "SIDNEY," has been obliterated by sulfuric acid pitting from use over a coal-fired or other sulfur-containing heat source.

 

[Kevin Eng]

So my pan's "O" has been erased by time and use? I suppose it's possible but I do not see anything at all, not a hint of an O. I guess once it's cleaned I'll give it a closer inspection. Thank you.