"Duofold" is a fine range of writing instruments introduced in 1921 by Parker, the exquisite line of writing instruments quickly became popular amongst pen enthusiasts and stamped its name in the world of writing instruments with golden letters. Modern Duofold pens also feature traditional Parker design and are available in variety of sizes. The attractiveness of the series is enhanced by Parker's high-capacity cartridge-converter filling system. The overall feature of the Parker Duofold makes it a practical and dependable companion for daily use.