For what it's worth I have an early 80's Nishiki international and it is one of my favorite bikes. Yours has some upgrades . Ie the Cyclone derailleurs and drilled chain rings. Mine has been modified with a triple chainring (48-36-24 teeth and either a 14-24 or 14-28 tooth Shimano hyperglide freewheel . I have also changed out the bars to 2" riser bars with Shimano friction thumbies and mtb brake levers. I really like the upright riding position. My 70 yr old neck and back don't get along with drop bars anymore.
This is not the lightest bike in my stable but for what I use it for - daily 6 mile ride to and from the YMCA it is just about perfect.