The DT set of the vaudeville song looks as if it was transcribed by ear (and with mistakes: "go out with game"?!), perhaps from the old De Danann record (The Star Spangled Molly, 1981) mentioned earlier. They didn't provide a proper attribution, but implied that they'd learned it off a Flanagan Brothers '78, which would have made a good 20 years after the song was written. The extra verse could have been added at any time.