Nib: 14k Medium Gold
The Opera pen was designed with what is known as the "squaring the circle" barrel. A round pen is squared off, but with a comfortable to hold design. This is an innovative design by Visconti that has been imitated by other pen manufacturers.
Inspired by the Vitruvian Man of Leonardo da Vinci, inscribed inside both a square and a circle, it gives the pen an ergonomic shape: squared and round at the same time. The pen body and cap being acryloid — resin with celluloid insertions.