Series 1 were the cars from the 2009 launch until 2012
Series 2 were the first 595 models, Turismo and Competizione
Series 3 cars had the TFT dash and a few other changes
Series 4 cars had the bodywork changes that came in from mid 2016
The changes in 2018 did not create a Series 5, these are still considered Series 4 cars.