This lens is in good cosmetic condition, and the elements are fungus and haze free, but the aperture mechanism needs a little love. When the lens is horizontal, or pointing down, the aperture moves freely. When it’s angled upwards the blades are sluggish when closing.
It’s likely ‘just’ some old on the blades, but needs investigation. The workbench here is full enough at the moment, so this one is being listed as spares-or-repair.