I have a 38 note Gavioli playing 8 tunes, labeled:

  Harmoniflute a Trombone.  Systme Gavioli Brevte & Patented.
  14 Rue D'Aligre, Paris.

Based on the address of Rue D'Aligre I would date the organ between
1845 and 1853.  The bellows were recovered in 1989 prior to my
purchasing it.  I have photographs of a Paris newspaper, from 1861
or 1862, that was used to line the bellows.  The serial number is 632.

Marc Kaufman

 [ Marc sent a longer email with more details to Hans van Oost.
 [ -- Robbie