James L. Tito, former CEO of Latrobe Brewing, opined that the "33" signifies the 33 words in the beer's original pledge of quality, which is still printed on every bottle: Rolling Rock - From the glass lined tanks of Old Latrobe, we tender this premium beer for your enjoyment as a tribute to your good taste.
The stats: Established in 1939; 4.4 percent alcohol by volume; 130 calories, 9.8 grams of carbs and 1.3 grams of protein in each 12-ounce can. The official description: “A premium extra pale lager.