Also, I got a Dyna 20B Type 2 High-Output MC
Here is your 20B type 2
It has a small badge on one side, only saying "Dynavector".
This is probably your model if there is only Dynavector log on the side.
If you want to check the specs for old models a Japanese library sources are much better to look for it. They know their stuff.
Funny that Dymavector own name for Micro Ridge was actually MICRO REACH!
What microscope do you use to look at the styli ?