I have some wide nibs. I find my 1.5 Lamy Joy nib to be wide enough to easily see my mistakes when doing caligraphy. I would find a 1.9 to be way too big...see below.****
I have a Pelikan 500 with a guestamate OBBB....in the '51-54 nibs were not marked and the rolled gold piston cap would not be engraved with a width because it would look crappy.
It's a pure signature pen. A legal name takes up 2/3rds to 3/4ths a page.
*****My Manuscript (a cheap pen) BBBB is for heading only. I probably have only written six words with it.........way too big to use. Headers only was my guess to it's use.
I find BB and OBB to be wide enough....but I have them in semi-flex so can get the nib to write a bit wider by pressing harder.....ie Demanding Line Variation.
I have 4 OBB's. Two are vintage and semi-flex. Two are regular flex; the old W.Germany Pelikan 600 (same size as the 400) and same width of the vintage nib.
The post '97 1005 is like all the post '97 nibs but the 200 is a fatter blobbier nib. It is a half a width wider than the 600 because it's made to write like a ball point by those who don't know how to write with a fountain pen.
In German stubbed semi-flex if your Hand is light enough you don't max the nib all the time, you can get line variation On Demand. Your nib will go from 1 X to the 3 X max....where you want it to be.
So the important parts of the word can be made even wider if you wish.
I tend to only max my semi-flex out to 3 X on fancy decenders at the end of a paragraph.
I'd look more in vintage German stubbed semi-flex OBB or BB than in modern for some nice flair in your writing, with out doing anything.
Semi-flex is to add flair to your writing, it is not a calligraphy nib. Some folks really, really over stress their semi-flex nibs thinking it is a calligraphy nib.
A wide nail nib will not give you line variation with out it being made a stubb or CI.
Do look at a Lamy 1.5 or even a 1.2 nib to see if they 'write' better than your giant 1.9 nib.They only cost @ $7.00 to check them out. And it is not difficult to change a Lamy nib, from my reading on it. I don't fiddle with Lamy in they make nail nibs, and I gave two, a Safari ( and a CPM-1 (M) away to hook someone on fountain pens.