Hi again

My bike is not a Miyata afterall...it's a Nishiki...stamped right into the frame..previously undetected because of poor repaint and discovered today after it was repainted. I need some help to identify please.
The frame is 50cm, Shimano 600 components (all of them...FB date code so FEB 81, derailleur, crankset, shifters...everything Shimano 600...fancy not plain) Sakae "Road Champion" handlebars, Sugino Saddle and quick release front and rear wheels (6 Cassettes? on the rear wheel). The wheels are Mavic. There is only one spot for waterbottle on the downtube (not one on the seat tube). I don't know the original colour of the bike ? blue because the cables are blue. The rubber on the brake hoods is brown.
Thanks for your time and sorry about the confusion.