The inscription 'Iridium Tipped' alone does not allow brand attribution, since many makers used this notation. In the forum Ric Lei was first guessed at, a less known historical maker whose safety models occasionally appear at shows and on eBay. Attribution to Kaweco also came into consideration, since the company history produced similar models. For safe determination, inscriptions on barrel and nib, dimensions and the filling system should be checked and matched with image material from specialised sources.