It is difficult to obtain an accurate history of a lot of these cars but I have a slightly different scenario for 0050, 0308M, 0328M. After the factory had used 0308M for the protoype series of the Mondial and then 750 Monza the car was sold to Barbara Hutton (ie Rubirosa). Sequentially it was given to Rubirosa for his birthday. Serial number 0050 (already owned by Rubirosa) was renumbered to 0328M. Serial number 0328M was then renumbered to 0308M That left it open to renumber #0308M to 0050M to avoid tax taking the car back to France. It left Rubirosa owning two of the cars. No doubt there will be a difference of opinion to the above.