Hofkwartier green ink made by P.W. Akkerman pen store in The Hague.
This bright bold green shades nicely in medium and italic nibs.
Originally made to celebrate their 100th anniversary, this ink comes in a vintage-style bottle with a narrow neck with a marble stopper, to create a well at the top to aid in filling pens.
Hofkwartier is a district within The Hague. Ackerman