Ok, I am looking at it. It is a Tominon lens, 135 mm f/4.5 in a Polaroid shutter from a MP-4 copy camera.
The shutter fires perfectly and it has speeds from 1/125th to 1 second and has the retaining ring.
You could Google this lens and see that it has a good reputation, maybe someone on this thread has
knowledge of the brand.
How about 40 bucks ?