In the year 1929 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. 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. Equipped with a differential piston-filling mechanismPiston filler including a 24 carat gold plating and an elaborately striped body made of celluloid acetate14 carat/585 gold nibNibs are refined with a rhodium decor and their writing qualities were tested by handColors: Red Stripe, Green Stripe, Blue Stripe, Black