The tune is "Wenn der weisse Flieder wieder blueht" (When the White
Lilac Blooms Again).  Here's a link to a 78 rpm record on YouTube
performed by Tanz-Orchester Geza Komor with vocal by Max Kuttner,
recorded in 1929:  http://www.youtube.com/watch?v=rw8QQociazs 

Hupfeld also adapted the same arrangement for the Pan Orchestra, and
I wouldn't be surprised if they also arranged it for Helios.  It's one
of those great dance band arrangements that brought a new dimension
to orchestrion music in the late 1920s and early 1930s.

Art Reblitz
http://www.reblitzrrestorations.com/