According to the 1997 auction catalogue, the example in the photo dates from 1957. The auction catalogue and various other sources state that they were produced between 1956 an 1957, but the more recent, wonderful book on Ydral engines by Catherine-Sophie Bouillard states that the Chantecler went on sale in October 1955. Somewhat different prototype versions having first appeared at the Paris Salon in 1952.