picked these up today. havent dated either yet. guessin the gt dyno compe is early 90's. and the schwinn im thinkin maybe 40's-50's. has a sweetheart skiptooth drive. i have a persons seat off a bf goodrich baged schwinn. does that look like a schwinn rear rack? and it had no stem or bars so we pulled this one off another schwinn he had. he said this one is a odd premium style. id has two slits on each side and a non wedged bolt. stinks someone cut the front fender . anybody got any news on these? also he had a ratty bicycle i wanna get off him. i can remember the name tho. i know i saw one on here somewhere. the frame looked similar to this schwinn and it had a tank. the badge said "thunderjet" or "jetbolt" or something of that nature. if anyone can think of what it might be, im all ears . thanks!