JIL 1234 is from County Fermanagh in Northern Ireland. When the rest of the the UK introduced the year identifier to registration plates between 1962 and 1965, Northern Ireland had no need to do so, as the number of cars registered there was still quite low. When the rest of the UK changed the system in 1983 and again in 2001, again Northern Ireland had no reason to do so, although the current system has been designed to allow Northern Ireland to adopt if if necessary. Effectively Northern Ireland is still running the pre-1962 system. Up to 1989, Northern Ireland plates worked on a system of AXX 1 to AXX 9999, followed by BXX 1. From 1989, the 1, 2 and 3 digit numbers have been retained for sale, so the normally-issued numbers now run from AXX 1000 to AXX 9999, followed by BXX 1000. The digits represented by "XX" above represent the county or city in which the car was first registered, and always include an "I" or a "Z". If you see a similar number without an "I" or "Z" then it is a older England, Scotland or Wales number from before the 1962-1965 adoption of the age identifier.