Here is a link to an old Nishiki that I restored for my daughter last year. http://home.atcjet.net/~whitlow/nishiki.jpg
It is a fine old bike. When I was working on it, I found that the frame tipped the scale at just a tad over 6 pounds, which is not bad for an old steel frame. It also has the heart shaped braze-ons, which were used to index the clampon cable stops. Built up to a really sweet bike! Enjoy yours!