I picked up this Nishiki Olympic 12 several years ago. It's a little too small for me so I just completed a rebuild and flipped it. It's a 1980 Olympic 12 that is almost all original. The saddle is not and the tires have been changed. Also, the original wheels were a coated steel. They were in very good condition, but they're not alloy. I had a set of alloy wheels just waiting for a home so I decided to swap them and put them on the Nishiki. The bike must have lost at least one pound due to that change.
Otherwise this is an original bike. The serial number is KI 12158