It is a genuine one alright. The number 6 has no relevance as to which number it is out of 100. The way the numbering system was devised for the TOMS altezza was as follows! The 100 cars were sent to 10 selected Toyota NETZ dealers in groups of 10. They were then labeled as to what district they were sent to i.e. the car in the pic is NF006 which means the 6th of 10 cars sent to the NETZ Foukira district(prob spelt wrong). I know this cos my one is NF003. Thus there are 9 other TOMS altezzas with the same number, but with a different prefix. hope this helps clear up any misunderstanding.
I BEG TO DIFF-ER!!