High Quality Content by WIKIPEDIA articles! The Portuguese Car number plate system for automobiles and motorcycles is simple and sequential. The system has no link to geographical locations or similar. It is an incremental numbering system consisting of three groups of two characters, separated by dashes. This system started in 1937 with AA-10-00, then went on to 00-00-AA and recently changed over to 00-AA-00. When this last sequence comes to an end, it will be replaced by the sequence AA-00-AA. A list of the first registration numbers issued each month since March 1992 (starting with 00-01-AA) is available at the website of the Automobile Association of Portugal.