This advert is possibly the earliest mention that I have found of the 5-speed version of Le Cyclo.

(Source gallica.bnf.fr/ Bibliothèque nationale de France)

• Publisher: Le Forez Sportif
• Country: France
• Date: February 1936
• Derailleur brands: Cyclo
• Derailleurs: Le Cyclo 5-speed, Le Cyclo 4-speed, Le Cyclo 3-speed, Le Cyclo 2-speed