For Sale: Used RARE Vintage SOUNDESIGN 8300 Mach II Calculator! Made in Japan! In good used physical condition.  Scratches, scuffs, marks from normal use/wear.   It seems it still has the plastic packaging film on the sides of the metal casing!   Does not work - I tried putting in batteries and it did not turn ON.   I'm not sure why.  Sold as-is for parts/not working.  Batteries not included.   Please refer to pictures for reference.   Thanks!!