We have featured many Esterbrook SJ fountain pens over the years, but this is our first with an Osmiroid nib. Osmiroid made a threaded nib assembly the same size as Esterbrook's. Osmiroid typically made nibs for calligraphers. As such, this nib is an extra-fine italic. You will write a surprisingly smooth extra-fine line with subtle line variation. We restored the vintage pen with a new ink sac. No cracks or deep scars on the pen. Justexpected wear from use. 12cm capped.