Shortly before the old forum went away, I saw Ken Davis's request for photos of Wagner pie logo #3 skillets with #1053F. He was looking at a pattern of casting flaws in Wagner #3 Pie Logo skillets with the F marking. At the time, I had a pie logo skillet in the lye bath that I thought might fit his criteria. Sure enough, mine was a 1053F with the same casting flaw.
I tried copying the posts from the old forum but all I could get was the text, no photos, so I'll let that go.
But I can post a new photo here for Ken of my flawed 1053F.