Noodler's Ahab - my first flex pen. But I'm not seeing the “flex” effect I was hoping for. Ink is OS Emerson (and I used gloves this time to fill it...) :
Fountain Pens for Artists: Noodler's Ahab
Amazon.com : Noodler's Ahab Flex Nib Fountain Pen - Ivory Darkness White and Black, Fine Nib 15028 : Office Products
Noodler's Ahab Flex Fountain Pen - Ahab's Pearl - The Goulet Pen Company