What does the number 33 mean on the back of the green bottles for Rolling Rock Beer of Latrobe, Pennsylvania?

The 33 words on the back of the bottle:

"Rolling Rock from glass lined tanks in the Laurel Highlands. We tender this premium beer for your enjoyment as a tribute to your good taste. It comes from the mountain springs to you."

http://www.straightdope.com/columns/read/389/why-is-there-a-33-on-rolling-rock-beer-labels



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According to James L. Tito, former CEO of Latrobe Brewing, the "33" signifies the 33 words in the beer's slogan: "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. It comes from the mountain springs to you."

https://en.wikipedia.org/wiki/Rolling_Rock#Number_33

Some people believe that the 33 is on the bottles because 1933 was when prohibition was repealed.

There are a number of theories as to what the "33" on the Rolling Rock bottle symbolizes, one theory is that 1933 is the year that prohibition was repealed.

http://www.snopes.com/business/hidden/rolling.asp

Good old "Cecil Adams" says they came up with the 33-word blurb and jotted down the number beside it. It was accidentally printed....and a legend was born.

http://www.straightdope.com/columns/read/389/why-is-there-a-33-on-rolling-rock-beer-labels

According to James L. Tito, former CEO of Latrobe Brewing, the "33" signifies the 33 words in the beer's slogan: "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. It comes from the mountain springs to you."
https://en.wikipedia.org/wiki/Rolling_Rock#Number_33

Some people believe that the 33 is on the bottles because 1933 was when prohibition was repealed. There are a number of theories as to what the "33" on the Rolling Rock bottle symbolizes, one theory is that 1933 is the year that prohibition was repealed.
http://www.snopes.com/business/hidden/rolling.asp

Good old "Cecil Adams" says they came up with the 33-word blurb and jotted down the number beside it. It was accidentally printed....and a legend was born.
http://www.straightdope.com/columns/read/389/why-is-there-a-33-on-rolling-rock-beer-labels

The most plausible explanation is that it began as a printing error:

http://www.straightdope.com/columns/read/389/why-is-there-a-33-on-rolling-rock-beer-labels

There are a number of theories as to why the 33 is on there, but no concrete answer as to why it is.

www.snopes.com (this lists many possible answers as to what the reason is.)

The family of James Tito, one-time chief executive officer of Latrobe Brewing (makers of Rolling Rock beer) owned the brewery from the end of Prohibition until the company was sold in 1987. Based on notes and discussions with family members now dead, James Tito believes the mysterious '33' got there by accident when family members couldn't agree on the wording of a slogan to be printed on the bottle, or even whether the slogan should be long or short. Someone eventually came up with the 33-word pledge now in use, and to emphasize its brevity, he drew a large '33' on the paper. The printer to whom this wording was sent mistakenly thought the '33' was part of the copy and included it on the labels. By the time the mistake was discovered, so many labels had been printed and affixed to bottles that it would have been prohibitively expensive to scrap and replace them, therefore the mistake was retained as a permanent feature of the label. Thus every Rolling Rock bottle now sports the following pledge:

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. It comes from the mountain springs to you. "33"

The "mistake" explanation doesn't sound terribly convincing since the printer who sets and runs off thousands of labels before providing the customer with a proof copy to approve does so at his own risk. And even if someone from Rolling Rock had mistakenly approved the label design, error and all, there was no good reason why the errant '33' couldn't have been removed from the copy before the next printing. So, the only real answer here is that no one knows the real answer. And perhaps that is the answer — after all, nothing helps sell a product like a little mystery.

On the Rolling Rock website, they say, "Nobody knows." and then go on to offer some of the theories that have been put forth. More than just four, by the way, e.g.:

Holiday theory - Rolling Rock was founded in Pennsylvania, where Groundhog’s Day is a very popular day. It’s also the 33rd day of the year.
Freemasons theory - The Freemasons are an international fraternal society that conspiracy theorists say is made up of prominent politicians and businessmen. The Rolling Rock 33 is a nod to them.
Bye bye prohibition- Prohibition ended in December 1933. Although Rolling Rock wasn’t produced until 1939, the owners wanted to celebrate the 21st amendment that allowed them to make beer.
A sign of quality - There is a 33-word quality statement on each bottle of Rolling Rock. “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. It comes from the mountain springs to you.” An incidentally scribbled '33' was on the label sent to the bottle printer, noting its brief length. The printers used this in the final copy and printed it as part of the label.
It's in the bottle - If you add the letters in Rolling Rock’s ingredients (water, malt, rice, hops, corn, brewer’s yeast), it equals 33.
Take your temperature - Thirty-three degrees is the temperature at which Rolling Rock is brewed. It’s also the temperature at which it should be served.
A day at the track - Legend has it that one of the founding members of the brewery bet $33 on Horse #33 (Old Latrobe) and won. Then, in 1939, he took his earnings and founded the Latrobe Brewery.

https://www.rollingrock.com/history.html
I'm guessing that anyone who thinks they have a definitive answer can't, at this point, be sure.