The drawings and designs of Leonardo da Vinci inspired this homage to the Italian Renaissance. Leonardo is known as a man of mystery, and this pen has that same air of mystery. At first glance, your eye is drawn to the amber cabochon on the knob end and the wonderful engraved patterns. Among fountain pens, it stands out, evoking the spirit of another era. This curious instrument could be used for a variety of functions; a holy water sprinkler; a container for precious fragrances, rare bits of scripture, or a very sharp blade. It is the sort of item that the people at airport security pounce on, questioning its use. When you first grasp this pen, it is not apparent how it opens, where the nib is, or how it fills. One would not assume it actually is a fully functional piston filler with a large ink capacity, but at 5 1/2' long, capped, with a barrel diameter of 7/16', that's exactly what it is. Different from most fountain pens, however, the cap cannot be posted. The overall look of this pen can be seen in Leonardo's Codex Atlantic us, where he made drawings of several writing instruments. The engraving on the cap and barrel are inspired by the Da Vinci knot pattern seen in Leonardo's painting, 'Lady with an Ermine'. The pattern engraved into the barrel and cap catches light, shimmering as the pen is rotated. Despite the fact it is solid sterling silver, The Ingegno Scrittorio weighs a modest 45.2 grams A machined ebonite (hard rubber) feed fits tightly under the smooth flowing nib. The pattern on the top end of the cap is based on another of Leonardo's linear explorations. The nib size M. The length of the closed pen is 140 mm. The Ingegno Scrittorio IS ALSO AVAILABLE IN GOLD.