Gasoline Alley is a long-running American newspaper comic strip created by Frank King that first debuted in the Chicago Tribune in late 1918.
Unlike in most comic strips, the time in Gasoline Alley passes at a reasonable pace and the characters grow old and eventually die. In its early run the main protagonist was a mechanic named Walt Wallet and most strips consisted of him and his friends Doc, Avery and Bill talking about automobiles. In 1921 Walt adopted a doorstep baby nicknamed "Skeezix", who eventually grew to replace Walt as the main character of the strip.
Jimmy anachronistically references the strip while having breakfast with Angela, Tommy and the cat in January 16, 1920, calling Tommy "Skeezix" a year and a month before the character was first introduced. ("Boardwalk Empire")