After a couple of under performing movies (by Jean-Paul Belmondo's high standards anyway), he returns with this movie which was the fifth highest grossing movie of its year in France.
There is a scene with a Tiger in this movie which looks harmless, but landed Belmondo in the Hospital for quite some time.
According to the credits, Julien Guiomar played "Fechner". Christian Fechner was the producer of this movie.