Yeah, that beat up M2 in my avatar shows the Super Angulon 21.
It belongs to my friend, Matt Cook, who looked at me as if I were demented when I asked him if he wanted to sell the lens (I even offered to buy the camera in the bargain).
"You don't sell lenses like this," he said, in the tones of a schoolmaster lecturing a student, "You BUY lenses like this."
Ted