It’s hard to believe there was a time when people didn’t know how to open a can. The “stay-on-tab” (or “pop-top”) slowly replaced the “pull tab” from about 1977 to 1980, because the latter was a major source of litter and sharp enough to be dangerous. The Pepsi can is from 1977, and the Coke can is from 1978.
Pics are from a fun blog called Soda Can Collection. (Where the hell does he put all those cans?)
2 Warps to Neptune 