Saw a Trek 520 (1984+/-) with, looks to be, original Suntour Cylone Mk II drivetrain and Sake Crank. It was the one with cantis on it. Look to have been left outside as there was lots of sun damage but little rust, if any. A good wax would have brought it back. He wanted $125 and said he would take $100. Tires and chain were shot. Wheel needed serious truing.