Not entirely sure about this, as this is my YOB pedal 🙂 but I might consider selling my MIJ OC2. it has its share of marks and scratches and the power input is a bit loose, (never been an issue in the years that I have this, got it that way) but otherwise 100% working ok.
Serial indicates its from Nov 1982.
£115 posted mainland UK might get me to part with it. PM me before I change my mind.