The Conway Stewart Sterling Silver Duro model is based on the classic Duro design first introduced by Conway Stewart in the 1920s. Uniquely, the Conway Stewart Sterling Silver Duros’ barrels and caps are crafted from solid sterling silver rods. A translucent resin veneer is then applied by hand, allowing the silver beneath to shine through. The Demonstrator is an exclusive finish offered by J. Rake. It's an unusual material marbled with black, deep blue, and clear resin. The clear resin allows part of the highly polished silver of the pen to be visible, giving a unique and eye-catching finish.