This Esterbrook ReNew replacement nib and feed unit is marked 9668, a Firm Medium nib made of stainless steel. Esterbrook ReNew nib units are interchangeable, and to change them, you simply unscrew one and screw in another one.
I'm new to fountain pens and I got this to replace a Firm Fine. The nib writes great, I have no complaints with it, it's just a much thinner line than today's pens. It's good to have, but I think I should go for a broad to get what I expect to be a medium line. Otherwise, I have no issues with the nib at all. Anderson is an awesome resource for Esterbrook nibs!
I needed to replace the nib on my vintage Esterbrook fountain pen and was able to quickly find one from Anderson Pens. My only complaint (and I use that word very lightly) was that the exact match to what I had was out of stock (price $10). I had to substitute a different nib for $25. I wish the less expensive one had been available, but other than that I’m completely satisfied with my purchase.
