I accidentally had a gravel bike in 1989. I had a 10 year old Schwinn Varsity10 speed. Green metal Flake. I put flat bars on it, left the shifters on the head set. Even back then I remember it was hard to find knobby tires (27 x 1 1/4″) I cant believe someone would steal that Frankenstein off my 2nd story balcony, but they did.
First real store-bought bike was in 1998. I used my bonus to buy a pair of Diamond Back Outlooks. One each for me & wife. Super Cool flat black paint scheme. They were quite nice looking,but the twist shifters were always out of whack & the brakes sucked. Rigid front fork & super steep head angle. No wonder she hated that thing.
I cant believe she still rides with me every Sunday. (Specialized Hard Rock w/dropper post & 2.8 WTB Rangers)