There are also counterfeit Gatsby lighters I have seen on Ebay as well. These are the lighters most 'faked' on Ebay. Dupont Linge (Line) 2 Lighter is authentic. This is a short guide on how to quickly determine if your S.T. Any idea when this Dupont lighter was made? Is it silver or some other metal? Somewhere I read that if one calls Dupont and give them the serial number. Dupont Pen - Help Identify Model / Serial Number - posted in Other Brands - Europe: Does anyone know the model of this ballpoint pen? Serial number on the right side of the cap: 5E1BJ12 Photos: Thanks. Found ST DUPONT LIGHTER IS THIS REAL? Hey is it a real st dupont or a fake? AUTHENTIC DUPONT: has Serial number marked at a different time as the. The lighter is gold in color with black inlay but It isn't marked with any metal content such as K (karat). Re: Help with identification of ST Dupont Lighter Thanks, everyone for your interest.