Montblanc Meisterstuck 163 Classique Stainless Steel Rollerball Pen. I've had this beautiful pen for many years and simply do not use it any more. I've just bought a couple of black medium refills so it comes with a spare as well as an unused cartridge. Please note that, whilst there are no obvious blemished on the pen, it is used and, like all of these it is uniformly covered in microscopic marks. I've used hi-res pictures so you should zoom in as much as possible to see what I mean.
There is also a faint'ring' where the cap has been repeatedly put on the back whilst writing.