Montblanc Leonardo Da Vinci Limited Edition Fountain Pen. 3,000 pens produced worldwide. Commemorating the inventive engineering of Leonardo Da Vinci. Medium nib. Piston operated fountain pen. Rhodium-coated 18 karat gold nib engraved with sketches of his flying machine. Platinum-coated clip, trim, and fittings. Clip with red gold-coated rotating gear on tip. Silver-toned cap and barrel.