The only thing I remember about Nishiki is that they used to make a good touring bike. I think, but am not sure, that they were distributed by Derby, which has gone out of business.

SunTour used to be the leading company in the Asian bicycle industry until Shimano came along and knocked them out of their top spot. They lost so much business that they closed shop and went back to China (or someplace in Asia). Much of their equipment --cassettes, shifters etc-- was not compatible with Shimano, but the last couple years, they were here, some of their top-end equipment was.

At $100. it might be a tad over priced, but you need to be the judge of that. If you should buy it, have it disassembled and all grease replaced and everything adjusted properly. Old grease coagulates and does not lubricate. This would be important of any older bike that has not been ridden in a long time.