Haha i wondered the same. Id have to guess its out of a farriers forge. I had seen chat of a few burners on here with 1/8” holes so thought id ask. It did have a few small pieces of fire brick on the burner side when I found it.
Thanks for all the responses guys. I think it would be far easier to build a modern fit for purpose ribbon burner off of plans from here. Maybe ill make a steak on this one.