This advert, from 1934, features BGA bicycles fitted with Cyclo gears. There is no mention of BGA's own Velectrik derailleur.

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

• Publisher: Le Forez Sportif
• Country: France
• Date: August 1934
• Derailleur brands: BGA, Cyclo
• Derailleurs: Le Cyclo, Cyclo Witmy