Of all the Pelikan fountain pen collections, the Souveran has been the most popular and widely used since 1929. The Souveran series has become iconic to the brand Pelikan. To this date, this fountain pen exists in many different variations, and though it has been developed in design and technical details over time, the basic mechanism remains the same. Pelikan was the first company in the world to introduce the differentiated piston mechanism. This technique causes the spindle inside the fountain pen to turn quicker than the end piece of the barrel, with the help of two different threads. In 1950’s, the model 400 was launched. The Souveran series consist of highly polished Resin caps and the barrel is made of Cellulose acetate. The Pelikan Souveran collection is available in 4 shades of barrels, Blue, Red, Green and Black and two trim options i.e Gold plated trims (M400) and Palladium plated trims (M405). The Pelikan Souveran fountain pen collections are available with a matching ball pen or a rollerball pen. Ball pens use the world standard jotter refills and the Pelikan roller pens use a proprietary refill. The production of the sleeve is work-intensive. Adhering to a special Pelikan recipe, the raw material cotton is processed through many different steps until it is shaped into a striped sheet. It is then formed into the right shape, cut and sanded with a diamond. The Pelikan M400 fountain pen series is relatively smaller and ideal for women and for men with smaller palm