I have an original accordina from the 30s, and I also had a replica made by Marcel Dreux in France. I later sold this, as I only needed one, and the original has panels on the sides which you can manipulate for a wah wah effect.
Accordinas are virtually identical to the Claviettas, and were made by the same man, André Borel. The Accordina uses buttons, the Clavietta uses keys. The reeds are the same in both, they were originally made of stainless Swedish steel.
I suggest you get hold of an accordina!