Company Back Story
Esterbrook introduced their first aerometric filler in the late 1950’s calling it the M2. The pen sported a metallic cap and plastic barrel in a period favorite color. The plastic used is soft compared to other pens, or but typical of late Esterbrook manufacture. M2’s are easily recognizable by their indented cap and plastic threads.

Esterbrook marketed for a limited time, a contemporary version of the M2. The new M2 Series incorporated the design of the original model with subtle modern details. The contemporary M2 Series is made from a special resin material developed to authenticate the feel and colors of the 1950’s. Each pen features a brushed metal cap and a specially design clip. The barrel has been etched and colored with an updated Esterbrook logo. Photo Credit: Fahrney’s Pens
My Pen
This M2 is in great shape, no scratches, no teeth marks. I even like the color of blue, seems very 1950’s to me. The pen has an aerometric filler. Admittedly, this is my first pen with an aerometric filler.


The plastic of the barrel and section “feels” odd to me if that makes sense. It’s doesn’t have a hard feeling like celluloid or acrylic, nor is it soft, it simply feels like plastic. The section is made of the same plastic as are the cap threads. The plastic threads are a concern. I imagine with some less meticulously maintain pens the cap threads are stripped.

The metallic cap has horizontal etched rings. Esterbrook is engraved on the cap band, M2 models are easy to spot because of the unique top of the cap – it dips in.
The aft end of the barrel is an air hole but honestly I spent a week looking at other examples under the assumption there was a jewel from the end, but noooooo.

The pen writes nicely, here I was using an Esterbrook 2668 Firm Medium nib. In my hand, the weight and size of the pen are most agreeable. I don’t post the cap. The ink is De Atramentis Black Red.
Bottom Line
I enjoyed using the pen. It feels comfortable when in hand. The Aerometric filler works well. The feel of the plastic is not something I’m familiar with and the air hole in the end is well ugly and cheap looking.
Overall, I am happy with the pen. It makes a nice vintage everyday pen with a 1950’s nostalgic look.
Vital Statistics
- Capped length. 134mm
- Uncapped length. 124mm
- Barrel diameter 11mm
- Cap diameter 12mm
- Weighs in at 18g
- Esterbrook.Net; M2