Cast Iron question

I went to a rummage sale today and they had 3 CI skillets for $5. I only wanted the deep Wagner fryer, but he wouldnt split them up so I took all 3. Got home and was looking at the odd ball one and I cant figure out what brand it is. I has a 7 on the top of the handle and an E on the bottom. Anybody know anything about this one?
Thanks as always!

