The model "Stylox Pulseuir M 190" largely corresponds to the Stylomine 303V described in the book "Füllfederhalter" by Andreas Lambrou (Heyne Verlag, translation Stefan Wallrafen) by the company Y. E. Zuber in Paris; a sectional drawing in the book serves for identification. The mechanism works with an internal rubber sac and an ink window in the barrel. Cleaning and disassembly take place via a water bath in which stuck parts are loosened. With old pieces from the 1950s, the rubber sac is often porous, which leads to leaks; spare parts, especially sacs, are generally no longer available, since the manufacturers no longer exist — such fountain pens are therefore in fact handled as one-off pieces. Talcum powder in the housing originally served to prevent the sac from sticking to the outer wall.