Once you find the model.....
Try past auctions on Ebay of your country.
You could look in our sales section.
What is the reason you are selling?
It's a fountain pen and has to be held differently than a ball point. Unlike a ball point a fountain pen is held after the big index knuckle.
You need absolutely no pressure in the nib floats in a small puddle of ink.
99.1% of those new to fountain pens press way, way too hard.
Scribbling becomes fun....fancy inks, great papers.....paper makes a great difference between some feathery blobby line on your Ink Jet Paper and something clear and crisp on medium good paper.
If you notice there are many fountain pen coms....and no ball point coms. We are having fun.
Stick around perhaps you can too.
German vintage '50-70 semi-flex stubs and those in oblique give the real thing in On Demand line variation. Modern Oblique is a waste of money for a shadow of line variation. Being too lazy to Hunt for affordable vintage oblique pens, lets you 'hunt' for line variation instead of having it.
www.nibs.com/blog/nibster-writes/nibs-germany & https://www.peter-bo...cts/nib-systems,
The cheapest lessons are from those who learned expensive lessons. Ignorance is best for learning expensive lessons.