Originally Posted by T-Mar

That's the first Nishiki serial number I've seen with that format, so I don't have a clue on the year. Kawamura may have had to subcontract some frames due to a insufficent capaicity beacuse of materials shortage, machinery breakdown, labour strike or any number of issues.

Assuming it is an Olympic 12, that model first appeared in 1978 and was still in manufacture as late as 1987. Obviously, it went though quite a few changes over that period. Having some pics or at least a list of the brand and models of the major components would help. Also colour scheme, list of frame fittings and any tubing decal info would help, if you can't provide pics.