Benu Crystalline Briolette Pen Holder
Benu's Briolette pen holder is designed to fit the Briolette series pens perfectly. It is made of resin, and will make a nice display on your desk.
Although it is meant for the Briolette, this pen holder works with many other fountain pens that are a little fatter and have a slightly tapered profile at the tip, e.g. the TWSBI Diamond 580 and Mini.
The opening measures about 15mm wide at the top, and 45mm deep.