One series of chassis numbers was used. MG Midgets chassis numbers contain a prefix and a serial number, such as GAN1L (prefix)/ 25555 (serial). Chassis numbers ran from 101 to 229526.

Chassis number

Midget

1. G , for MG car
2. A, for engine size between 948 and 1275cc
3. N, for roadster
4. X, number is type. 1, 2, 3, 4, 5
   
5. L, ( if found ) for left-hand drive ( or blank for right-hand drive )

Engine number

1275cc Engine numbers

12CC/Da/H 1967

12CE/Da/H 1968-1971

12V586F 1972

12V588F 1973

12V778F 1974

FP for 1500CC 1975-1979

Making sense of body & engine numbers
Explanation of engine numers

Body number

Midget : GBE troughout