"The stem is hideous and I am wondering if it's a replacement..? No idea who made it."

LOL!
That's one of those Modolo 'death' stems.
The look of them is either loved or deeply hated by bikers. I guess you fit the latter group.
I happen to adore the different look of them. Even though they turned out to be a flawed design.
They snapped with no warning at the binder and the handlebar and rider would go flipping forward onto their face.
The fix is to replace it with a safe stem.
Should you toss it, please send it my way. I can use it for my garage queen.