The side of the clip for a serial number. Unlike the sharp and deep styles found on any of my ST Dupont pens. ST Dupont may have a record of all the lighters they've produced. Ligne 2 models & using genuine corresponding serial numbers on them. It would be very useful but on the other hand, if it were easily accessible, there's nothing to stop the determined faker from copying e.g.
I've been buying and selling them for a while & I don't know where you can look up the serial numbers, if at all. › █ █ █ St Dupont Pen Serial Number Search █ █ █