4C chassis numbers are ZAR9600000M******, except for US-market vehicles which are ZARBAAA4**M******.
The 4Cs at the last Geneva motor show, for example, were 70765, 70766, 70767, 70768.
However, you won't be able to know how many 4Cs have been made by looking at the chassis number of one, because every car made at the Maserati plant in Modena follows a single numbering sequence, regardless of the model. Which means that the first 4C they built wasn't chassis number 1, it was whatever the progressive collective number of cars made at the Modena plant was at that moment.
Also, because of that, you will have one or more consecutive 4C chassis numbers, then one or more Maseratis, then more 4Cs, and so on. So they're not even necessarily contiguous, and you won't be able to guess how many were made by looking at two 4C chassis numbers produced a few months apart, because you don't know how many Maseratis were made at the same time.
Last edited by MacGeek; 18-12-13 at 14:19.