There is no doubt that the S 100 is the barometer for what Summit were doing at any point in time. Whilst other model numbers came and went, the 100 seems to have been ever-present!

The S.100 also provides a good potted history of barrel stamps, so I will include the various examples next to the respective pen


Curzon S.100 Flat-top

I am currently unclear exactly when the first S.100 was launched, but I believe it would have been in the late 1920's - early1930's that the S models superceeded the earlier H range. The S.100 being very similar to the H.100:

S 100 blue 

(The Blue S100 varies only slightly - clip and domed cap - from the Green H.100)

blue s.100 barrel stamp


Another early example of a flat top S.100,  from Simon Griffin's Collection:

tortoiseshell s100 flat-top 


These pens measure about 135mm, and seem to come with Warranted nibs.


Curzon S.100 screw top 

In the mid -1930's the S100 takes on the design that was going to become the familiar style of Summit / Lang products.

Much smaller than the earlier S.100, these measured in at aprox 121mm, and the company name / logo appears to have been dropped from the gold plated furnishings:

s100 green hatch 

(photo above provided by Alan Charlton)  

s 100 ribbon

s100 ribbon bs


s.100 amber


amber bs 

(note the Curzon practice of having the model ID turn up anywhere!)


This model S.100 was used for the production of the Stephens 106, examples of which are below:

106 black

Above: Stephens 106 black (photo. Alan Evered)

Below: Stephens 106 Pearl (photo. David Thal)

106 bs



Curzon S.100 Double Jewel 

It appears that long before  the introduction of the S.175 Mark 2 (Double Jewel), Curzon had manufactured a S.100 DJ. These are scarce, but appear to come in attractive designs;  

s100 blue 

s100 dj 

s100 dj


Summit S.100 (post WW2)

Lambrou's "Fountain Pens of the World" notes that Summit pens were more conservative than their peers. I guess he was reviewing the post-WW2 productions, such as this S.100 below, rather than the Curzon delights above.

Carrying the Summit name in isolation on the barrel stamp, these early Summit S.100's come with nickel trim as standard. The Summit name appears on the pocket clip of later productions, and the original nib seems to have  routinely carried the Summit name.

My experience is that these are less prone to discolouration, than the S.125 model, but that the furnishings are more likely to be found with corrosion / pitting. 


100 black


100 bs 


Summit S.100 Cadet  

As post-WW2 production returned to something like normal, Summit expanded and rationalised their model range. The S.100 was now clearly defined as a student - level pen, being given the "Cadet Model" label. However at 132mm the dimensions, and the general quality, matched the model above.  The nib remained 14ct, and carried the "CADET" name rather than Summit.

s100 cadet


cadet bs



A later S.100 Cadet was manufactured that resembled the later S.125 Mark 2, in that it came with the ribbed plastic barrel. The barrel stamp was also moved to run below the screw thread at the top of the barrel. Also like the 125, this pen had a 'cheap' feel to it, that is perhaps unjustified.

cadet 2 

 The S.100 cadet with the ribbed barrel (and a 14ct Summit nib).