The Vespa crosses the one million mark (1956)

While the Lambretta was starting to enjoy some success, the Vespa was being copied and imitated in a thousand ways: but the uniqueness of the vehicle ensured Piaggio a very long period of success, so much so that in November 1953, the 500,000th unit left the line, followed by the one millionth in June 1956. In 1960 the Vespa passed the two million mark; in 1970 it reached four million, and over ten million in 1988, making it a unique phenomenon in the motorised two-wheeler sector it has sold over 16 million units to date.

From 1946 to 1965, the year Enrico Piaggio died, 3,350,000 Vespas were manufactured in Italy alone: one for every fifty inhabitants.

The boom of the Vespa, and the different business prospects of the Piaggio brothers, with Enrico concentrating on light individual mobility in Tuscany and Armando on the aeronautical business in Liguria, led the company to split. On February 22, 1964, Enrico Piaggio acquired the share in Piaggio & C. S.p.A. held by his brother Armando, who then founded "Rinaldo Piaggio Industrie Meccaniche Aeronautiche" (I.A.M. Rinaldo Piaggio).

The Vespa 50 had appeared the previous year, 1963, following the introduction of a law in Italy making a numberplate obligatory on two-wheelers over 50 cc. The new scooter was exempt from this law and was an immediate success. In Italy sales of vehicles with numberplates decreased by 28 per cent in 1965 compared to the previous year. On the other hand, the Vespa, with its new "50" series, was a great success. The light Vespa was a successful addition to the Piaggio range and this displacement is still in production. To date almost 3,500,000 Vespa 50s have been built in different models and versions, the latest being the ET4 50 launched in autumn 2000. It is the first four stroke Vespa 50cc, and has a record range of over 500 km with a full tank.

The Vespa PX (125, 150 and 200cc) is the biggest sales success in the entire history of the Vespa. It is the "original vintage" - launched in 1977, it has sold over two million units, and as such is a favourite among those with a sense of nostalgia but also with the younger market.