Next up on my Esterbrook nib list is the Esterbrook #9460 Rigid Medium Nib. The box also refers to the nib as a “Medium Manifold.” A 1959 nib chart specifically says the nib is for carbon copies. A more specific term for this nib would be “tank.”
The Osmiridium tipping (probably mostly iridium) gives it added durability, if not smoothness. Add to this the extra strength of a manifold nib intended for use with carbon copies and this nib could be used as a weapon and then be used to write a letter.
My particular nib is very smooth, one of the smoothest Esterbrooks I have. It’s almost too smooth, especially on smooth paper. I prefer a nib with at least a hint of feedback. But between the dull medium point (compared to a extra fine) and the tipping this nib glides over the paper.
I do experience some occasional skipping, especially on slick paper. It isn’t enough to be annoying, especially since I don’t use medium nibs very often. The nib tines are just slightly misaligned. It doesn’t really seem to be enough to matter but it might cause the skipping if I angle the pen just right. I hate to tinker with these vintage nibs and since I rarely use a medium nib I can live with the skipping.
The Esterbrook #9460 Rigid Medium is a nice nib, if you like medium nibs. I prefer extra fines and fines so it’s not a nib for me. It does put down a nice line. While these Esterbrook nibs can vary, even among the same nib number, this nib was too smooth, especially on paper that is also smooth. If you like a little feedback this may not be the nib for you.