Returning to the Mr. Jack title, the strip continued until at least 1919. The latter date is given in some sources for Swinnerton's work, though Markstein notes that some later strips depicting Jack surreptitiously drinking alcohol behind the backs of police officers appear to date them to the Prohibition era of the 1920s.
Returning to the Mr. Jack title, the strip persisted until at least 1919. The latter date is cited in some sources as Swinnerton's work, although Markstein suggests that some later strips depicting Jack secretly consuming alcohol behind police officers' backs appear to be from the Prohibition era of the 1920s.