Hansa Anastigmat Enlarging Lens 75 mm f/4.5

This lens was supposedly used on one of the early Hansa enlargers by Ōmiya Shashin-yōhin K.K. (近江屋写真用品株式会社) and probably originates from around 1936. While it has "Hansa" written on it, as far as I know Ōmiya didn't produce lenses themselves. So I'm very curious who was the original manufacturer of this particular lens. If you have any knowledge or information on that, I'd really appreciate it, if you can share it.

Despite its age this simple uncoated lens (with a 4/3 Tessar design, if my observations are correct) still works really well and while I haven't used it extensively you can see a couple of testshots here as well. I'm really impressed by the craftsmanship it surely requires to get a lens to work flawlessly for such an amount of time.