I snagged a '79 Kenko last spring and refurbished it to use as a summer beater. Same headbadge thats on yours...just an awesome design.

The spec on my bike was odd too. Hiten tubing and fork, yet aluminum hubs and rims, and all alloy components.
Interesting mix of entry level and midlevel.

Short cranks for larger frames, higher components than youd figure...maybe they spec'd based on what was cheapest and readily available.