I've added a short addendum to an article I wrote on my web site describing how pens were made in the US in 1857, a year before Esterbrook opened his factory in Camden. In the original article, I point out why the processes are almost exactly the same in the US in 1857, and in a later description of how pens were made in Birmingham in 1890. The common connection is that both are set up and run by British pen makers.
In the addendum I tie this directly to Esterbrook's pen factory in Camden. I have a map of their factory in 1885 and you can easily see where all of the various operations took place. I've also included a sales card used around 1920 that shows the various steps in making a pen which seems that at least the same steps are being used, even if some may be done by machines instead of hand-operated screw presses.
I thought some of you may find it interesting. I'm sure that when Richard Esterbrook opened his factory in 1858, the pens were made exactly as described in the article I'm quoting from 1857. It seems that this process continued to be used at least through the 1890's, and most likely into the early 20th-century.
If you're interested,