CP1 Cartier Diabolo Black Composite Fineliner pen with original (black ink) Cartier filling. Reference ST180011. Pen is in great condition and is complete with the original box and papers dated 2008 from an authorised Dutch Cartier dealer. On top of the cap is the distinguishing Cartier blue sapphire. On the inside of the clip it says "Germany". A great find and it would make a fantastic gift!