I made a video demonstrating one of my favorite nibs: the "Blade Turk" custom grind by Mark Bacas from nibgrinder.com
The nib is sort of a super-ultra-fine architect grind, which means the downstrokes are thin and the cross strokes are wide... but not very wide, being so fine.
Here's a gallery of images showing the pen, the nib, and some art I made with it.
The shape is curved a bit, so the line variation changes based on the angle as you use the pen.
It's amazing. The nib is on a TWSBI 580alr which is like the 580al except with some trim differences and a ribbed grip section.
It's a great pen, great nib, and I definitely recommend Mark Bacas's nib services for modifications or repair. I will definitely go through him again for more custom pen work...
Junkyard Sam is a Seattle area artist, illustrator, and designer.