Sizes

The question I’m asked the most is regarding the size of my pens.

Here is a guide with lots of comparison photos.

Below are the different size diameter pens I make, measured at the barrel threads, with common pens listed below each similar size as reference.

Newton Thin – .43″/10.9 mm Ø threads, down to .355″/9 mm Ø section.

Newton Slim – .45″/11.5 mm Ø threads, down to .427″/10.8 mm Ø section.
* Esterbrook J is .45″/11.4 mm at the threads
* Parker 51 about .47″/12 mm at the ring.
* Pelikan 200/400/600 all about .43″/11 mm at the threads.

Newton Small – .50″/12.5 mm Ø at threads, down to .477″/12.1 mm Ø section.

* Montblanc 146 is .48″12.2 mm at the threads.
* 1935 Parker Duofold Sr. is .49″/12.5 at the threads.
* Pelikan M800 is .49″/12.5 mm at the threads.
* 1930s Sheaffer OS Balance .49″/12.5 mm at threads.
* Sheaffer PFM/Legacy about .49″/12.5 mm at section/barrel join.
* Lamy Safari .48″/12.3 mm at barrel ring.

Newton Medium – .55″/14 mm Ø threads, down to .527″/13.4 mm Ø section. 

* Pelikan M1000 is about .53″/13.5 mm at the threads.
* Montblanc 149 is .562″/14.3 mm at the threads.

Newton Large – .60″/15.2 5mm Ø threads, down to .57″/14.5 mm Ø section.

Newton Oversize – .65″/16.5 mm Ø threads, down to .62″/15.75 mm Ø section.

Newton Jumbo – .70″/17.75 mm Ø threads, down to .67″/17 mm Ø section.


Newton Giant – .75″/19 mm Ø threads, down to .72″/18.25 mm Ø section.

* Indian eyedropper – .74″/19 mm at threads with .59″/15mm section.

Lengths – Measured with the cap off, from point of nib to end of barrel.
Measurements with cap on may vary depending on style of pen or if it will have a clip.
Shorter – 4.75″ or 120 mm open.
* Esterbrook J is 116 mm long open
Short – 5″ or 127 mm open – long enough to house a converter or other filling system, but no longer than that.
* Parker 51 – 127 mm open.
* Pelikan M800 – 127 mm open.
* Lamy Safari – 129 mm long.
Standard – 5.25″ or 133 mm open.
* Pelikan M1000 – 135 mm open.
* Montblanc 149 – 133 mm open.
Long – 5.5″ or 139.7 mm open.
Extra – 5.7″ or 146 mm open.
Longer?  – You tell me what you want.


Slim Slideshow

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Small Slideshow

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Medium Slideshow

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Oversize Slideshow

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Small diameter, short length Shinobi next to several well known brands.  That’s 5 inches open, from tip of nib to end of barrel.

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Small diameter, short length Breaker with Esterbrook J, Parker 51, Pilot Kakuno, TWSBI, Breaker, Pilot 823, Pelikan M800, Lamy Safari, Montblanc 149.

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Small and Medium sized Prospectors

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