1 is real tiny, 2 is small...normal starts at 3-4-5, six is large, 7 big...8 real real big.
I don't know if a nib & pen I gave to a school kid, was a 7 or an 8.
It was defiantly much bigger than what I'd envision a 6 too be.
I still have a single vintage very large nibbed pen, but am not going to be opening that pen soon, where I could take a knock out block and see how big it is a 6 or more than likely a 7.
If that is a 7 the other was an 8...it was real huge.
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.