Sheaffer - Füllfederhalter

I sell this rare Sheaffer set of fountain pen and ballpoint pen. They are old new in box. The fountain pen has a 18k gold nib. The size is nog specified, by the looks of it I would say Fine.
The pen works with disposable cartridges, or with the proprietary press fill reusable cartridge (included). There are also some disposable cartridges in the box.
I ship these in their original packaging with certificate of authenticity.
The ballpoint pen is in mint condition. The fountain pen has one spot on the back of the grip (see photo). I don't know how it got there because the pen has never been used. It does not seem to be flaking of paint because I feel no relief differences between the black grip and the gold spot.
The barrels are made out of some kind of lacquer: green and black. The color slightly changes under different orientation and lighting conditions, which is very pretty and special.