Stolen from a CA article, his cigar rolling ability was known and while in Cuba he demonstrated his cigar rolling talents. Although he preferred large cigars, he was able to roll perfectos quite well, as is seen in this photo. It is supposedly legit and I can't find the article about this occurrence, I might've seen it in some documentary.
To say young George was mischievous would be an understatement. He was always getting into trouble roughhousing and tossing tomatoes at police officers in the hardscrabble neighborhood surrounding his father's saloon. By age seven, he was impossible for his parents to control or for his father, who put in long hours at the saloon, to discipline. As Babe's daughter Dorothy recalls, his parents sent him to St. Mary's Industrial School to ensure that he learned a vocation. The strict institution--a combination orphanage and reform school--was run by an order of Xavierian Brothers who taught Ruth how to make shirts and roll cigars.
Source/Cigar Aficianado magazine