Most nishiki's are Kawamura products. Maybe in later years production (at least some) shifted to taiwan, T-mar would know for sure... but my bet is on Kawamura, not Giant.
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1 Super Record bike, 1 Nuovo Record bike, 1 Pista, 1 Road, 1 Cyclocross/Allrounder, 1 MTB, 1 Touring, 1 Fixed gear