First CB750 I remember seeing would have been in 71. I was 13 and riding one of these.

My first bike, a well used, unloved hand me down from my older sister. It was the special model with the rusty tank, broken off kick start shaft and cut off front fender.
I was with my parents and we had just made it on a local car ferry as one of the last vehicles when a 750 parked behind us at the very back of the ship.
After the owner had left I went over to check out this very cool looking bike.
Disc brake, 4 cylinder, then I saw it. It had 4 carbs and with the hours I had spent after school trying to keep my 50 going with carbs issues I thought "poor guy, he'll never keep this thing running"
How little did I know.😄