Nishiki, Univega, Diamondback, and Raleigh were all made in China by Raleigh USA. Nishiki and Univega brands were abandoned by Raleigh some time ago. The Nishiki name is now used by Dicks as a sort of house brand for bikes they design and sell.
To answer your question, I don't know because they are made for Dicks only and haven't received much attention from these forums.