I read it the say way as you, but it's wrong. Both hubsets were available much earier, though I can't tell you the exact dates on their debut. For instance, Pro-Am is mentioned in the 1976 Fuji catalog and the Gyro is mentioned in the 1977 Fuji catalog. Also, the author claims a 1979 date of introduction for SunTour's Superbe hubset (manufactured by Sanshin) but these go back to the 1977 model year.

Thxs for posting your Comp II, though I'd appreciate it if you could post date codes for the major components. The reason I'm asking is that it appears Nishiki spec'd an idnetical Comp II for 1982 and there's a possibility that it may be a 1982 model manufactured in late 1981. The date codes may help to determine the exact model year. TIA.