Thanks Russell.
Yes that's it. It is a nice old skillet, except for the long diagonal crack near one of the pouring spouts. I cleaned it, put some oil on it, but did not season it. I'm holding onto it as an example of 1) a Blacklock 2) a cracked sidewall.
Worst of all, I worry that I caused the crack. My lye barrel is shallow. I often stack several pieces in it at once. I cannot be positive that I didn't stack a slightly larger piece inside of the Blacklock and then load more pieces on top of that - stressing the sidewall outward. On the other hand I might not have caused the crack even there was extra weight on the Blacklock. The crack could have been there all along. You can see it in the pics posted in March.
It's just with such a thin sidewall... it seems possible that I contributed to the demise of a fine old skillet.