The Constancon Braillewriter, a braille typewriter for the blind, was produced ca.1919 by Fabrique d'Instruments de Précision S.A. of Luasanne, Switzerland. It was invented by Charles Maurice Constançon and Jean Jacques Auguste Aubert. The Constancon Blindenschreibmaschine seen here is the No.2 model and I would be interested in it as well as the No.1 model.
Have one for sale? Please email me at Antikey.Chop@gmail.com