Maybe it doesn't have one? people might slap a logo on everything nowadays but it's never been a requirement for a product to be quality. Looks like a nice cast iron to me
Of course they have been, but we have been mass producing simple items like these for well over a century or two. I'm simply saying I wouldn't be surprised if this specific style of pan was sold/manufactured by more than one brand if not unbranded altogether.
This looks exactly like the set my grandparents gifted me. They were in a large wooden box from Costco that was bought YEARS ago! Came with a cast iron skillet and 2 more smaller cast iron pans. I would bet that it's from this set.