Kaweco Sport Piston Fill - Fountain Pen KitSince 1883, there have been various systems for filling a fountain pen. Today, ink cartridges are a widespread and popular filling method. In the past, fountain pens were mainly filled using ink bottles. Besides lever fountain pens and eyedroppers, the piston mechanism has been the most important and reliable filling system. In 1937, the Kaweco Sport fountain pen was first presented as a piston filler under the name #612 and has been further developed