I am advised by the Revenue Commissioners that registration numbers are assigned under section 131(5) of the Finance Act 1992. The registration number assigned at the time of first registration in the State remains assigned to that vehicle and must be displayed at all times until the vehicle is scrapped, destroyed or sent permanently out of the State. An owner of a vehicle which is 30 years old may request that the registration mark originally assigned to that vehicle be replaced with a registration number in the ZV series.