I don't know about the 800's...which are nails. I do have a Lamy 18 K nail OB on a Persona.........that was only for folks with left eye dominance who cant the nib automatically to see the top of it....or left handers. I had absolutely no line variation.
Pendelton Brown turned it into a straight CI....and line variation.
I have '50-65 Pelikan, MB, Geha and other makes in stub semi/maxi-semi-flex Obliques and even lucked into some 30 degree grind one each in OBB, OB, OM and OF.......and my Pelikan 500 is a pure signature pen, OBBB and 30 degree maxi-semi-flex.
Out side my 500 which as bling signature pen, I have the feeling in no one else reports factories offering it, that the 30 degree grind may have been from the Fabled Ol'Corner Pen Shoppe's back room........."Want a bit more flair to your Oblique? Wait five minutes."
I have tested modern regular flex 200's oblique nibs I trans-mailed to a pal in England in there are a lot of Idiots in Germany who refuse to mail outside of Germany ....nothing....I did have a nail 99 Lamy OM....nothing at all....
I have a W. Germany 200 OM, I won in a live auction, and hoped the fabled extra springy nib would do the trick.....nope....would have to mash to the max all the time to get anything.
I have some 12 Oblique 15 degree nibs in a mix of semi&maxi...... 4 in 30 degree in OBBB, OB, OM, & OF also mixed, semi-maxi..................you can have fun with a 140, 400, 400nn, Geha 790, or MB 234 1/2, or a Mercedes from the '50-65-70 era.
A Stub or straight CI in the 800 would give you line variation.....I really don't think stubbing an OM nail is going to do much at all.....but perhaps some folks will show what a stubbed nail does.
I tend to doubt that an Oblique stub or Oblique CI does much or everyone would be bragging them, which they don't.
If you don't like the 140-400 size....a '50-65 nib will fit the 600.
A lot of folks talk of the 'line variation' their modern nail, semi-nail oblique gives them.....I look and don't see much at all....one has to look and wish dream......in comparison to German '50-65-70 era, where you have clear line variation due to a stubbed semi-flex oblique.
Edited by Bo Bo Olson, 06 December 2017 - 14:41.
www.nibs.com/blog/nibster-writes/nibs-germany Info on Bock nibs
Due to Mauricio's improved definition of Super-flex, I try not use the term Easy Full Flex, but fail...sigh.
Semi-flex is an “almost” flex; not a ‘flex’ nib. It is great for regular writing with a touch of flair. It can give you some fancy; but it is not made for real fancy writing. For bit more of that get a maxi-semi-flex. Both spread tines 3X. Those are not "Flex" nibs.
Wider than Normal does not exist. Wider than Japanese does. Every company has it's very own standard + slop/tolerance. Developed from the users of it's pens and inks only; not the users or inks of other companies pens. The size you grind a nib to, is your standard only. Paper and ink matter to nib width. Thank god for 1/2 sizes or it would be boring.