Hi
Agree with T-Mar's post. My info nuggets: Sold by my LBS in mid-late '70's, I remember three levels, labeled Thunder, Storm (I think) and Lightning from low to high. In 1977, $ 180.00 of my hard-earned paper route money bought a beautiful shiny black Thunder model. Steel lugged frame, nice quality, Suntour components , def. not top-shelf, but better than department store and low end Huffy/Schwinns of the time. Rode the piss out of it for a year or two, bought a car and that was it. It spent the next 25 years in a succession of garages and basements, I just couldn't let it go.
Last year , decided to get off my ass and lose some weight. I replaced the tires and up graded the seat to handle my 311 lbs and put another 200 miles on it before buying my Trek 2000. I still can't part with it yet...but right now I prefer the new bike (17 more gears, and about half the weight...)
tom