Sailor Pro Gear Fountain Pen - Transparent with Rhodium Trim - Anderson Pens, Inc.
Opal Junior Demonstrator Fountain Pen - Clear Acrylic Barrel, Aerometric Filler, Steel Fine Nib (Excellent, Working Well) - Peyton Street Pens
SAILOR King of Pens Pro Gear Fountain Pen - Demonstrator Transparent Crystal | PenSachi - Japan Limited Fountain Pen
Amazon.com : Ackerman Pens Super Sketch Piston Filler Demonstrator Fountain Pen, uses any ink, slip nibs and feeds in and out *note: pen will be dark gray, not black as pictured :
PILOT Prera Demonstrator Fountain Pen - Green | PenSachi - Japan Limited Fountain Pen
Opus 88 Omar clear demonstrator fountain pen - Fontoplumo
Fine Writing International Fenestro Demonstrator Fountain Pen - Silver – Gourmet Pens Shop