Well I picked up my fourth Nishiki a couple of weeks ago. This time a Competition. I'm guessing about a 1975 model based on the SunTour date code on the rear derailleur. The paint is pretty badly scratched so I have made it into my weekend beater and use it for joy rides on my days off. The serial number is KS328728 with the large script W on the bottom bracket shell. I have changed just a few things: Spidel pedals, 6-speed freewheel, side pull brakes, and swapped the 46 tooth ring for a 42. I have also started stripping paint from the forks and stays to create half chrome stays and forks for the classic look.

Current list of Nishikis:
1972 Semi-pro
1975 Competition
Nishiki Pro, late 70's
Nishiki Rally, early 80's