Parker Duofold MK I Green Marble Rollerball PenThe Parker Duofold Green Marble Rollerball is a high end writing instrument that is part of Parker's Duofold collection. Produced around 1988. The pen features a green marble design on its barrel and cap, which is created by layering different shades of green resin to create a unique marbled effect. The pen also features polished chrome trim and a Parker arrow clip, which adds to its elegant appearance. It is a refillable pen. The design and build