this is my finest stub and my oldest pen.
A pre-1907 Mabie Todd & Bard Swan 3003 eyedropper with "short nib, fine" as it was called those times.
And when they said fine, a very fine nib was meant:
This one gives 0.28 to 0.30mm lines vertically and 0.21mm horizontally on paper.
Edited by SchaumburgSwan, 28 August 2020 - 22:13.