Model and nib width are not directly noted on the writing instrument on the 146; a reliable determination is best made by presentation at the specialist retailer or by comparison with model databases on the net. Gold nibs last, thanks to the iridium tipping, practically a writer's lifetime; a nib exchange at service costs around 49 euros and should be weighed beforehand in the shop through test writing. For longer writing, finer nibs (F or EF) are rather recommended; ultimately, the choice is a matter of taste. One tank filling suffices, experience shows, for about 20 to 30 pages; the ink window does not show the exact fill level but only serves to indicate an approaching end of ink, which can best be judged if the pen is held horizontally against the light for about ten seconds.