DISRAELI DOCUMENTS
This advert has Simplex celebrating Fausto Coppis victory in the 1949 Tour de France race using the Simplex Tour de France derailleur. This was a crucial event in derailleur history. The story goes that Tullio Campagnolo was so embarrassed that the Italian Champion of Champions was using a French gear system, that he buckled down and produced the epoch-defining Campagnolo Gran Sport.
(Source gallica.bnf.fr/ Bibliothèque nationale de France)