Vehicle registration plates of Switzerland  Vehicle registration plates of Switzerland, are composed of a two-letter code for the canton and a number with up to 6 digits. The rear plates also display two shields with the flags of Switzerland and the cantons. The sizes of the plates are 300 x 80 mm (front), 500 x 110 mm (rear) or 300 x 160 mm (rear, high format). The current style was introduced in 1972. The control signs are assigned to the car owner and not to the vehicle. If the owner changes the vehicle, the same control signs are attached to the new vehicle. The previous vehicle receives the control plates of the new owner. In some cantons, when control signs are returned and retired, they are made available again after a certain time. Until 2020, vehicles in the Italian enclave of Campione d'Italia were registered in Ticino, but are now to be registered in the Italian town of Como. Swiss diplomatic plates display one of the prefixes "CD", "CC" or "AT", followed by a canton code, a serial number and a code for the country or organization. Low serial numbers are reserved for ambassadors or the head of an organization and their deputies. Diplomatic Codes (UN Missions)     Diplomatic Codes (Int. Organizations)     Diplomatic Codes (Countries)     Civilian Federal vehicles had registration plates composed of the Swiss shield followed by the letter "A" (short for "Administration") and a number with up to five digits. The first digit indicated the department. In 2004 these plates were replaced with normal cantonal plates. The Post, Telegraph and Telephone company (PTT) and the Swiss Federal Railways (SBB) were part of the federal government until 1997/98. Their vehicles had registration plates composed of the Swiss coat followed by the letter "P" (short for "Post") and a number with up to five digits. When they became independent companies, the P-plates were replaced with cantonal plates in 2004.