Not much as they werent around that long. These were manufacured in Japan
and distributed by Suntech Electric and J.S. Kansas Acoustic guitars as I recall a company in Kansas. I purchased mine from the Toon Shop in Prairie Village Ks in 1978. It is my recolection that the Suntech brand was completely new on the Market and they were not cheap. Retail was close to $800 and due to a long relationship with the store through my grandmother (long time music teacher) $600 plus change out the door.
I havent seen anything outside of these dates from 78-84. Suntech put the most god awful logo on the headstock i believe to fend away the Gibson legal actions brought against other manufacturers like Tokai, Bunny and Ibanez, but otherwise the guitars were damned close to the Gibson with one difference, they were better..... I was told on a subsequent trip to the Toon Shop that the company had ceased production in the wake of Gibsons patent infingement suits and the Japanese manufacturer had been bought by Gibson to produce Epiphone and the owners cashed in their chips before they had their clocks cleaned. An interesting piece of info, Daryl Stuermer of Genesis played a Suntech from 1978 - 1984.
Let your buddy know, if he wishes to sale, I am a buyer.