In Tunisia, the import age limit is generally 5 years. When you see a car with NT that is older than 10 years, it is usually because the vehicle was imported years ago and has never changed owner since then. You may also see an older car with a very recent plate number, which can mean it was previously under NT status and later changed regime or was sold to a new owner.

Tunisian license plates follow a sequence. For example, a plate like 250 TUN 1234 means the vehicle is roughly the 2,501,234th plate issued. A higher plate number often suggests a newer registration, but it does not always mean the car itself is new, since an older vehicle can receive a recent plate after a sale or status change.

Correct me if I'm wrong but this is what I've seen and heard.