I have just become the new owner of a 1970 P1800E, chassis #32,444...As I'm working through the resoration process (starting with getting the engine to start !) I've recorded all the important serial numbers and have come across one I don't know the meaning of. The number is part of the plate under the hood in the engine compartment and is recorded under the Vehicle Type/Color/Upholstery code sequence. The number is "S-5951". Does anyone know what this Volvo "special" code stands for? Thanks.