What does the mysterious '33' on a bottle of tasty Rolling Rock stand for? Could it be the year of it's debut? Nope, that was 1939. How about the year prohibition was repealed? Maybe, that was 1933. Perhaps the number of the racing horse pictured on the label? Or the number of letters in the Rolling Rock slogan? The list goes on and on, but there is one thing everyone can agree upon...These are some wicked cool tumblers! Get a set of your own to see if you can figure out the mystery for yourself.