Established in Milan in 1922, Sertum was one of the most dynamic and important Italian motorcycle manufacturers of its day. Fausto Alberti decided to add the even more demanding design and construction of motorbikes to his existing production of precision mechanics, which had been his business for some time. The notoriety of Sertums grew rapidly in the early Thirties, due to the Batua, 175 Utilitaria and 250 models, as well as the production three-wheel goods and other vehicles. Sertum soon achieved success in sport, too, especially in regularity events. Two years before the company closed in 1952, it developed an innovative 125 cc light motorcycle, but the machine went into production. The prestigious author Mario Colombo put his beloved Guzzi to one side in order to write his passionate, short but intense story of Sertum bikes, based on his careful reconstruction of the facts and systematic cataloguing of the various models, supported by rare illustrations of the period. The book also offers useful advice on the restoration of the machines.