Introducing the Selectic derailleur - which has no lever, cable or even rods. You change gear by back-pedalling more than a quarter of a turn. On a 3-speed freewheel, the gear sequence goes high to middle, middle to low, low to high, and then around again.

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

• Publisher: L'Officiel A.C.M.
• Country: France
• Date: April 1951
• Derailleur brands: Selectic
• Derailleurs: Selectic