Exxon Graftek G-1
In the era of steel frames, where ALAN aluminum frames were very flexible and titanium frames were rare exotic beasts, the Exxon Graftek carbon frame was truly a piece of space-age unobtanium! While it was really just a wrap of carbon fiber around an aluminum tube, it still was the most exciting bit of tech to arrive for some time!
for context, here's an advertisement from a 1978 issue of Bicycling magazine:
and a few photos of a Graftek displayed at the 2018 Classic Rendezvous gathering....
head tube
down tube
rear dropouts
cranks and bottom bracket
and the seat stay bridge
Steve in Peoria