Advanced for its time and featuring a reliable method for filling ink, the Conklin Crescent Filler® attracted attention from many prominent figures of its time. In 1903, renowned American author and humorist, Mark Twain, became the official spokesman for the Conklin® brand. In celebration of Conklin's innovative design and Twain's passion for the fountain pen, the Mark Twain Crescent Filler® is now available in a new and electrifying shade: Rainbow.
Each Crescent Filler utilizes Conklin’s groundbreaking original design, one that still works as effortlessly as it did a century ago. Crafted from metal and plated with a rainbow PVD, this limited edition pen is a beauty to behold and is tastefully engraved with Mark Twain’s signature along the band. Each pen still maintains the original Conklin® spring loaded rocker clip that was patented in 1916, the perfect addition to any pocket, jacket, or coat.
This fountain pen is offered with your choice of a reliable, smooth-writing German made JoWo #6 steel nib in extra-fine, fine, medium, broad, or 1.1mm stub, or the new JoWo Omniflex flexible steel nib for variation in line width. With six nib options, you are sure to find a selection to fit your handwriting style.
We do our best to photograph the pens to show how they will appear in person, but due to the nature of the material, expect some variation in the pattern from what you see here.
Our note about the JoWo Omniflex nib: This flex nib will allow you to experience more bounce and softness than writing with conventional nibs. You can achieve some line variation with a little additional downward pressure, to a point. We recommend flexing the nib to about twice the line width that you would see without using any pressure. Please take care to avoid pressing too hard on the nib, as over-flexing could prevent the tines from returning fully to their original position and decrease or stop your ink flow.
Each pen is housed in a luxury gift box with an included bottle of ink.
Limited to 1898 worldwide.
- Fountain Pens
Whether or not the barrel of the pen is translucent, allowing you to see the ink and filling mechanism inside.
- Body Material
- Cap Rotations
For pens with a screw-cap closure, how many rotations it takes to uncap/recap the pen.
- 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).
- Compatible inks & refills
Which ink this pen will accept. Choices include bottled ink and various styles of pre-filled ink cartridges.
- Bottled inks
- Filling Mechanism
How the pen fills with ink. Click here to watch our video tutorial on common filling mechanisms.
- Crescent Filler
- Grip Material
- Nib Size
- Extra-Fine, Fine, Medium, Broad, 1.1mm Stub, Flex
- Nib Color
- Nib Material
Whether or not the cap fits securely onto the back of the barrel when open.
Whether or not the nib/tip can retract into the body of the pen (usually for click or twist-open style pens).
- Diameter - Body
- 19.8mm (0.78in)
- Diameter - Cap (without clip)
- 14.6mm (0.57in)
- Diameter - Cap (with clip)
- 17.9mm (0.70in)
- Diameter - Grip (mm)
Measured from the place most people choose to rest their fingers, which varies with each pen.
- Length - Body
The measurement from the back end of the barrel to the tip of the nib.
- 128.5mm (5.06in)
- Length - Cap
- 66.1mm (2.60in)
- Length - Nib
The measured length of the visible portion of the nib when it is installed in the pen, from grip to tip.
- 22.3mm (0.88in)
- Length - Overall (Closed)
- 144.0mm (5.67in)
- 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.
- 173.1mm (6.81in)
- Weight - Body
If a converter is included with the pen, this weight is reflected in the total.
- 45.0g (1.59oz)
- Weight - Cap
- 30.0g (1.06oz)
- Weight - Overall (g)
- Max Ink Capacity - Piston Vac
The maximum volume of ink that can fit in the pen when using the built-in piston or vacuum filling mechanism.
Reviews & Questions
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!
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.
You can learn more with our Fountain Pen 101 video on Filling Mechanisms on YouTube.
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!
Conklin Mark Twain Crescent Filler Fountain Pen - Rainbow (Limited Edition)
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