I had just left a job at McDonald’s (yes!) when these prices went in, which would be about 1970-71:
Back then, when they said “limited menu,” by Grimace, they meant “limited menu.”
And the 60-cent Quarter Pounder, adjusted for inflation since 1971, would now be, um, $3.50. I had been making $1.95 an hour, 20 cents over the minimum wage; that would be $11.48 today. Make of that what you will.