It is registered and cannot be used by other manufacturers.
1 bit is the car classification code.
For example, 1, 2, 3, 4, 5, 6 stands for 1 series cars, 2 series cars and so on.
The higher the number, the bigger and more advanced the model.
The third number refers to several generations of each series. For example, 307 is the 7th generation of Series 3, and 308 is the 8th generation of Series 3.
The second "0" may be upgraded to X 10, X 1 1 after the third digit reaches 9.