I doubt blacksmith made.
Looks like a casting.
I see that, but CI wouldn't have the structural strength, imho. In compression it is almost as strong as some steel, but tensile strength isn't much better than some bone. You can't work it, hot or cold. A ductile iron maybe, but it would be a strange application. Still might not be strong enough.
Cast lines would have to have been been cleaned up very well, but do that and leave the sand texture?
Do you thing that texture could be from patina / rust? Paint can do that to steel.
Chilly
BTW I only ever claim 85% accuracy. Better double check anything I bring up, just to be safe.