Maybe you can remember as far back as when new car license plates were issued every year.
Maybe you go back only as far as when they were issued every other year, in the early 1960s.
You probably don’t remember when Massachusetts was the first state to issue license plates in 1903 (New York was the first state to require them in 1901, but it was up to the car owner to obtain them.)
Here is a very interesting site run by a license plate collector, with Massachusetts plates through the years, and with samples of plates from all over the country, and some history about our license plates. They weren’t always made of tin, and they didn’t always come in a standard size. A lot of them are still made by prison inmates in many states.
How many of us entertained ourselves by searching out plates from different states on long car drives? You could call it an American pastime.