Wow! That's very high tech for 1979!
I like the retro styling though.
Do you have any idea of it was a Japanese-market product or a US one?
Check the voltage rating on the bottom.
US only would be 110-120V 60Hz
Japan would be 100V 50Hz & 60Hz
So it might read 100-120V 50/60Hz if it was intended for Japan and North America.