Watsonian sidecar body numbers can usually be found on a brass plate located beneath the seat or, on the wooden dashboard (if the model has one). It is possible to identify the year by the letter prefix as follows:
Model numbers start with A in 1950 and run to Z in 1972, starting again at A in 1972 and continuing to X in 1993, when Watsonian ceased to number bodies.
Watsonian Brochures 1922-1995
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