The fountain pen described is unmistakably a Montblanc Slim Line. In the English-speaking world, the Slim Line range is often mistakenly assigned to the Noblesse series, which stems from a lack of familiarity with the model history. Characteristic is the polished decorative surface on the centre section, which consists not of a separate ring but of the polished surface of the barrel itself. Detailed model overviews can be found in the vintage section of fountainpen.de.