Many times, there are situations when we just cannot answer or identify a piece. I can not tell from the pictures provided if there are any markings on the bottom of the skillet.
I see the number on Top of the handle, the Heat Ring placement, and shape of the handle... but those are features that could be one of any number of makers.
Unfortunately, there are many, many more Cast Iron Cookware items that are unmarked and Unknown (likely forever), than there are "Identifiable".
JMHO... :) :)
While there are many websites out there that have become very proficient at data mining and data collection, that does not necessarily compute to 'knowledgeable".