The 146 Le Grand is identified, among other things, by the viewing window, which is missing on the 144. When buying at a specialist retailer, there is the possibility, within a certain period, to have the nib width exchanged free of charge. A subsequent nib exchange outside this period is significantly more expensive; currently the costs are around 187 euros, earlier lower amounts in the region of 50 euros are no longer current. On the nib itself, the nib size is usually stamped as a small letter.