The J Double Jewel in Copper which is 4th from the top in the first set of pictures was purchased about 3 months ago from E-Bay and I just started using it today.
The pen measures 5-1/16" (128.5 mm) capped and 6-1/2" (165.1 mm) posted. The diameter of the barrel is 1/2" (12.7 mm). The pen, when full of ink, weighs 0.57 ounces (16.2 grams). The pen by no means will wear you out during a long day of taking notes.
The nib is a 2668 Firm Medium for "General Writing". The line is what I would consider a "healthy" medium and puts down a fatter line than my Pelikan M200 or Lamy Al-Star mediums (but not by much). The nib is very smooth and as the ink is layed to paper there is no skipping or excess. I have noticed that this nib does require that you hold the pen in a more particular way as to much of an angle will cause the nib to become "toothy". I just filled it this morning so I am not sure how long the ink will last but I have filled one and a half pages with notes during work.
I have attached pictures and a pdf file to demonstrate the lines and I apologize for the poor quality of the picture. Please also pardon the grammatical errors in the photo as I did not feel like taking another picture. If you have a favorite Esterbrook, I would recommend this nib if you have not tried it yet but please note, if you are a F or XF nib kinda person, it will not be for you.
Edited by EventHorizon, 07 June 2007 - 21:29.