This is a limited edition (300 produced only) of Pilot's incredibly popular Custom 823 model in Green colour. This green edition is exclusive to Japan only. I believe was made for a certain store in Japan and Sold Out. Difference from regular model- Obviously the colour of the resin. Then the cap band has diamond shapes instead of stars and it says GREEN on the band too. Nib: M Filling system: Vacuum filler. The pen is brand new. Will come in original box and Pilot’s international warranty card. Please feel free to text me for any queries. Thanks.