The wine barrel French Oak staves I have used produced very fine grain, excellent turning. Your first shown pen shows good years in the growing pattern ie pic 2, the bottom 2 exhibit the fineness I am used to. Altogether 4 pics display an array of nibs the first three with cut sides, last one intact, all fine nibs, all different lengths protuding.
I am interested, viva la differance and all that, please explain mate about nibs. Recently I wrote a letter of significance to a family of friends and used one of my fountain pens, rather than ink up I used it as a dip pen it yielded heaps of writing between dips.
Liked the changes in design for your pens. Thanks for sharing.
Peter.