Peliakn Souveran M800 Writing Instruments are a true classic, and one of the best selling Writing Instruments at Bittner, the Pleasure of Writing worldwide. In the year 1929, Pelikan introduced the differentiated piston mechanism, and was the first company in the world to do so. 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. To this date, this fountain pen exists in many different variations, colors and sizes. Though it has been developed and refined in design and technical details, the basic mechanism remains the same.