In my random searches I've come across a lens I'm not familiar with and can't find much info on - a "Mitsuki" 90-230mm zoom in M42 mount.

I've searched around and apparently Mitsuki was a Japanese lens manufacturer in the 80's, but I can't find much more info than that (complicated by the fact that Mitsuki is both a fairly common Japanese first name, and a popular anime character).

I have found some references to 135mm and 200mm primes made by them, but not the zoom.

Anyone with any experience with this zoom lens?