Diplomat Aero Fountain Pen - Oxyd Brass
This Diplomat Aero fountain pen features a Zeppelin-inspired brass body with groove-like depressions on the barrel and cap. It has a satisfying soft sliding click cap that posts securely onto the barrel when writing. It features a smooth writing #6 JoWo silver stainless steel nib, a matte black grip and trim, and fills via standard international cartridge/converter (both are included).
Note: The converter you receive may vary from what is pictured here.
Click here to shop all compatible short standard international ink cartridges.
- Condition
- New
- Brand
- Diplomat
- Type
- Fountain Pens
- Color
- Gold
- Demonstrator
Whether or not the barrel of the pen is translucent, allowing you to see the ink and filling mechanism inside.
- No
- Body Material
- Brass
- Cap Type
How the cap is opened/closed from the barrel of the pen. Some common options include Snap-Cap, Screw-Cap, Magnetic Cap, or Capless (no cap).
- Snap-cap
- Compatible inks & refills
Which ink this pen will accept. Choices include bottled ink and various styles of pre-filled ink cartridges.
- Bottled ink, Standard international short ink cartridges
- Filling Mechanism
How the pen fills with ink. Click here to watch our video tutorial on common filling mechanisms.
- Cartridge, Converter
- Grip Material
- Metal
- Nib Size
- Extra-Fine, Fine, Medium, Broad
- Nib Color
- Silver
- Nib Material
- Steel
- Postable
Whether or not the cap fits securely onto the back of the barrel when open.
- Yes
- Retractable
Whether or not the nib/tip can retract into the body of the pen (usually for click or twist-open style pens).
- No
- Diameter - Body
- 14.8mm (0.58in)
- Diameter - Cap (without clip)
- 14.8mm (0.58in)
- Diameter - Cap (with clip)
- 17.6mm (0.69in)
- Diameter - Grip (mm)
Measured from the place most people choose to rest their fingers, which varies with each pen.
- 10.0mm
- Length - Body
The measurement from the back end of the barrel to the tip of the nib.
- 128mm (5.04in)
- Length - Cap
- 64.1mm (2.52in)
- Length - Nib
The measured length of the visible portion of the nib when it is installed in the pen, from grip to tip.
- 22.2mm (0.87in)
- Length - Overall (Closed)
- 139.6mm (5.50in)
- Length - Overall (Posted)
When the cap of the pen is posted onto the back of the pen body, this is the measurement of the entire pen including the nib.
- 159.1mm (6.26in)
- Weight - Body
If a converter is included with the pen, this weight is reflected in the total.
- 56g (1.98oz)
- Weight - Cap
- 21g (0.74oz)
- Weight - Overall (g)
- 77.0g
- Max Ink Capacity - Cartridge
The maximum volume of ink that can fit in the pen when using a cartridge.
- 1.03ml
- Max Ink Capacity - Converter
The maximum volume of ink that can fit in the pen when using a converter.
- 1.12ml
Customer Reviews
Relative to an aluminum Aero (which I love) it’s heavy. This works for me. Build quality is excellent. Cap close is satisfying. Steel nib is good, but not great. I’d like this pen more if there were more nib options.
I waited a long time to buy a Diplomat Aero, because how many cartridge/converter pens with a #6 Jowo steel nib does a person need? Well, that depends. Most pens of this type can be described by saying "Writes good, but...", or "Looks cool, but...". However, the Diplomat Aero sets itself apart from the rest of the field by eliminating the "..., but...".
The Oxyd Brass version is a hefty pen, no doubt about that. The weight is distributed evenly, so it's not going to tire your fingers/hand/arm/shoulder any more than a lighter pen would. Fit and finish is some of the best I've seen, and I would put it in the same category as other German high end fountain pens. And whereas some of those other pens only see the light of day when you want to sign that special document, the Aero is intended to be a Daily Driver. The "drivetrain" is based on a Jowo #6 nib and feed unit, but Diplomat puts their touch (and branding) on it, making sure that the nib performs reliably and consistently. The ink is supplied by standard international cartridges or a Diplomat-branded version of a Schmidt K5 type converter...nothing fancy, but nothing proprietary.
Some all-metal pens have an annoying habit where the parts that are screwed together come loose; the Diplomat Aero has a small rubber O-ring at the bottom of the threads that prevent the body separating from the grip section unless you really want them to. The cap will not unscrew, because it's a slip cap that provides an audible and haptic "click" when the cap is seated properly. The cap will spin, but that won't make it come off, and that doesn't affect the seal which keeps your nib from drying out.
The nib and feed on my pen are perfect. Ink flow is not too dry, not too wet, and there are no skips or hard starts. My other Aero has a 14k nib; it's slightly smoother because it's a slightly bigger tip, but otherwise feels the same as the steel nib. Neither steel, nor 14k gold nibs are advertised as flex nibs, and you risk damaging the nib if you push on them too hard.
The pen isn't low-priced, but...instead of "precious resin", you get a relatively thick walled brass pen with components that will provide years of trouble-free service, consistently and reliably.
This is a very good pen. I have the EF nib and it writes thinner than my Custom 823 F to my eyes. However it is probably smoother writing than the 823 which is surprising since the 823 has a gold nib and this diplomat has a steel nib. I’m very happy with it so far. It is also very heavy but that’s what I wanted. If you want a light pen then this one is not for you. It feels very high quality in the hand.
This is a beautiful pen. As another reviewer states: pictures do not do it justice. It looks so much better in real life!The weight (for me, anyway) is just about perfect. This is a heavy pen, so be aware if that is something you are not interested in.
Pen started right up after inking it with provided converter. Smoothest experience writing so far. Weight of pen feels good and balanced in hand. Clicky from capping pen is on so satisfying.
FAQs about Fountain Pens
How do I fill a fountain pen with ink?
It depends on the pen's filling mechanism, which you can find in the Technical Specs section above.
Here's a quick definition of the most common filling mechanisms:
- Cartridge - A small, disposable, sealed plastic reservoir that holds fountain pen ink. These come pre-filled with ink, and typically you just push to insert them into place and you'll be ready to write! Check out our quick guide here.
- Converter - A detachable and refillable ink reservoir that allows you to use bottled ink in a cartridge-accepting pen. Typically you will install the converter into the grip section, dip the nib/feed into the ink, and twist or pull the converter knob to draw ink into the converter. Here's a video for how to fill a cartridge/converter pen using a LAMY pen as an example.
- Eyedropper - A pen that utilizes the entire barrel as a reservoir for ink. Ink is directly filled into the barrel, allowing for a high ink capacity. Here's a video on how to do it!
- Piston - A type of filling system that uses a retracting plunger inside a sealed tube to draw ink into a pen. They are typically either twist or push-operated. These pens cannot accept cartridges or a converter, and only fill from bottled ink.
- Vacuum - A push-style piston that uses pressure to fill the large pen body with ink. They seal the ink chamber when closed, making it ideal for flying without risk of leaking. Check out our video on how to use a vac filler here.
Check out more info on these filling mechanisms including a video on how to fill each one on our blog.
How do I clean a fountain pen?
It depends on the filling mechanism, but it mostly comes down to flushing it out with water, and sometimes a little bit of Pen Flush if the ink is really stuck.
It's a bit easier to show than to tell, so we've put together a few quick videos showing you the process:
How often do I need to clean my fountain pen?
We recommend a good cleaning every 2 weeks, and any time you change ink colors.
Water will usually do the trick, but we recommend you use our Goulet Pen Flush if the ink has been left in the pen for a while and could have dried up, or when you’re switching ink colors.
My pen won’t write! What do I do?
First things first... make sure you have ink in the pen! Be sure that the ink cartridge or converter is seated properly in the pen, and that you aren't out of ink.
We always recommend you give your pen a good cleaning first, using our Goulet Pen Flush, or a drop of dish soap in some water. New pens often have some machining oil residue left in the feed, so a good cleaning often does the trick first.
If that still doesn't work, try priming the feed. This consists of either dipping your pen nib and feed in ink, or forcing ink from the converter down into the feed.
If it’s still not working after that, please reach out to us so we can help!
What's your return policy?
You can submit a return request within 30 days of your order date. You can read all our Return Policies here.
To initiate a return, please submit a request at the Return Portal. Our Customer Care team might reach out to you for more information.
Please note we are unable to accept a return of any Namiki or Sailor Bespoke fountain pen for any reason once it has been used with ink. Please thoroughly inspect and dry test the pen before use.