I would really love to get into Vintage Montblancs and have been watching quite a few on eBay as well as locally. Are there any that people would recommend? I've mainly been looking at the ones in the title, and I've also had some trouble distinguishing nib size names. I like Fine pens (not Japanese Fine), and have been looking for a Fine Vintage Pen, but I've been seeing like KF and I heard that the K stands for Kugel... But I am unsure what that means (I think it has something to do with the bounciness and flex?).
Also any tips when looking at these vintage pens? Like what to look for, hidden problems, piston filling mechanisms that tend to fail from certain models, or perhaps a rubber gasket or O-ring that always disintegrates, so I'll have to look at replacing it every now and then, etc?
And any tips for what I'll have to do when owning one? Just so I know how much trouble I'll need to go to to own it (replacing specific parts every now and then, or sourcing the parts, or perhaps specific parts that are impossible to find, and hence once the pen has a problem, it's impossible to fix)
Or any suggestions on any other MB Vintage pens would be welcome as well!