I understood FC used Bock nibs.
I don't know how fat and blobby they are so it could be turned into architect grind.
Are you sure you want an Italic Grind? That's a sharp paper catching grind, and you will have to hold the pen before the big index knuckle and canted to get all the Italic nib will do.
If you want to hold the pen behind the big index knuckle like a fountain pen, a slightly rounded Italic.....Cursive Italic does well.
Do make sure the nibmeister has a picture of you holding a pen and a sample. CI requires a grind that matches your hold.
If you have real good eyes you could go F on your M, in CI. There are folks that think Euro F is fat. I don't.
I suggest CI M on your B. (Any nib will lose a slight tad of width when changing the pen to CI. ....could be for Stub also.)
Your B could could go architect if it is fat and blobby enough.
First you have to find out if FC is as fat and blobby as modern Pelikan 400/600/800..
Edited by Bo Bo Olson, 28 February 2019 - 19:34.
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.