Hello

I have a Nishiki Sport in blue. I rescued it from rusting away in the basement of my apartment building. It was missing the brakes, pedals, and saddle, so I don't have any specs on them.

The serial number on the outside of the right rear dropout is 355143.
Both derailers say "Maeda Industries, Ltd. 4532 Japan." They are branded "Sun Tour Honor."

Can anyone tell me when this bike was made and maybe where? Without any letters in the serial number I can't tell what it means.

Thanks!