Dear Nicholas and other MMDers,  I'm 100% sure the tune played by the
38er Voigt is the "Ungarische Lustspiel Ouvertuere" by Keler; I have
a piano roll of it and also a recording by an orchestra.

But Keler wrote a lot of overtures, including a "Lustspiel Ouvertuere"
[Comedy Overture]; perhaps this is the book you have on your organ,
Nicholas?  I'm quite curious, I have to admit.  (Of course, Robbie is
right: titles often get mixed up, certainly nowadays with the copying,
etc., but that's for another discussion.)

Best wishes,

Bjorn Isebaert
Zottegem, Belgium