Below you will find an overview of the known dated events in this instrument's history. If you have any to add, please feel free to contact me.
Heartfield-related instrument #566 produced at the FujiGen Gakki factory in Matsumoto, Nagano, Japan
Bought by Charles Cook from eBay user jc74868 (USA); at that time the control knobs had been replaced by gold-coloured ones
Latest known owner Charles Cook (USA)