hifi engine

Technics stereo system SA-500 Series

I have the above stereo system from new.. circa 1980...complete with original operating instructions & connections/setup manual in original plastic bag!
Im selling system..& wondering what the current value would be.

Technics Quartz turntable - SL-5200 direct drive auto
Technics speakers-SB 5 Honeycomb Disc Speakers
System..Woofer,Mid Range,Tweeter,Protector reset overload..110w input,75w Din
Serial #'s avail.
Was an exp system when bought new.& Amazing quality
Any other info would be appreciated