Hi all. I just posted some pictures of a French Rally pen, made during the war, that I bought from a French buyer on Ebay some time ago. It is fitted with this huge Swan Eternal #8 nib. The thing is, it has this imprint on it of which I would like to know more about. On the bottom of the nib it say: 'FABon'. Does anyone know more about this? Does it perhaps has something to do with the fact that it is on a French pen?