After having digested all the technical information supplied by the concessionaires of the period, and having created thousands of illustrations showing all the versions produced by Innocenti between 1947 and 1971 piece by piece, the author has brought to life a guide that shows even the smallest modification carried out over the years on the various models that have appeared in the marketplace. Due to those illustrations, it is possible to see when a particular modification was introduced during the production cycle of an individual model. The book is also enriched by dozens of original documents of the period published in colour, production graphs and, no less important, all the official technical specifications of the Traffic Control Authority for the registration of Lambretta vehicles.