I think that this leaflet, produced by the UK importer of Simplex, dates from around 1957. The Tour de France model described has pulley wheels with the part number 900.

This leaflet was generously lent to me by Andy Fraser.

• Publisher: Simplex
• Country: Product from France, leaflet from UK
• Date: 1957?
• Derailleur brands: Simplex
• Derailleurs: Simplex Tour de France