sm serial numbers

The serial number of a Citroën sm can be found on a small identification plate located at the right chassis rail close to the engine. Next to this identification plate the serial number is also stamped in the chassis rail.
To first 2 numbers are 00 or 01, the next 2 digits are SB (2,7 liter carburetor engine with manual gearbox), SD (3 liter engine with automatic transmission), SC (2,7 liter fuel injected engine with manual gearbox). The last 4 numbers are the car serial number.
The table below shows the sm serial numbers in relation to the "commercialization" dates (when the cars left the factory).
Not all the serial numbers in the sequence below were attributed. A number of SB cars exported to the USA until October 1971 had the 2,7 liter engine with automatic transmission. When the first SB series numbers ran out at SB 9999 (June 1972) Citroën produced another series of 2,7 liter cars with automatic transmission for the USA. These cars had the 01 SB numbers and were produced together with the first SC cars. Not all the SD cars are automatics. About a third of this series of cars has the 3 liter engine with the manual transmission, a model that was much appreciated in the USA).