A chassis number is a serial number used to identify a motor vehicle manufactured before 1989.
It is a series of numbers/letters attached to or stamped on a vehicle by its manufacturer.
You can usually find a chassis number in the engine bay or on the chassis itself.
The chassis number may also appear on the vehicle registration papers. Please note, it is not the vehicle registration number.
Unlike a VIN, there is no standard number of digits for chassis numbers and they may not be unique.