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Thought I'd create a reference thread on ST Dupont Montparnasse & Chairman model fountain pens. Think these unique design and high quality pens deserve a post about them. Hopefully, most will agree...... Like with some other similar threads (example, see Delta pen reference threads...), would like this to be a 'reference thread'. By that I mean to keep the thread less of a conversational or 'pen review' thread and mostly a listing of descriptive information about the pens. So, would ask to avoid posting subjective or judgmental info that would be in a typical discussion post or pen review. Hope this makes sense.... Hopefully, the moderator will make this a sticky thread as it should be a useful reference guide to these pens over time. If you have a variation of these pens, like a finish or pattern that I don't have, please add a post with your pen (a few photos and short description would be good...). So, here we go...... I've now amassed 6 Montparnasse (including one LE pen) and 3 Chairman model ST Dupont pens. So, most of the pens in this series. All of the pens I have are in the Large size. There is a smaller size available. Smaller size is a tad bit shorter and narrower diameter, otherwise basically the same pen. Here's some group photos of the pens; capped and uncapped. From left to right in photo: 1. Montparnasse Black 2. Montparnasse Blue 3. Montparnasse Green 4. Chairman Grenat Green 5. Chairman Grenat Red 6. Chairman Ambre (Amber) 7. Montparnasse Ecaille (often called marbled brown or tortoiseshell, thanks jar for correct name) 8. Montparnasse Silver Godron (lined pattern) 9. Montparnasse Silver Mozart LE General Info Approximate Dimensions (Large Size Pens) Length - Pen Capped: 13.8 cm (5.5") Barrel Diameter - Wide point (near start of gold section ring): 12.5 mm (0.5") Barrel Diameter - Narrow point at end of barrel: Only about (1/32") narrower diameter Length - Uncapped (from end to tip of nib): 12.4 cm (4-15/16") Length - Uncapped (from end to end of section at nib: 10.4 cm (4.125") Length Cap: 4.7 cm (1-7/8") Diameter Cap - Wide point: 15 mm (0.625") Nib Imprint: 18ct 750 with cursive 'D' in middle Will add a separate post for each series of pen, with info and photos soon, so, that you have a better idea of what each one is like. Hope you find this interesting and useful. If so, I might do another reference thread on the great Olympio model pens of which there are many versions. Again, please try to keep this thread free from miscellaneous comments or subjective opinions. We can do that either on another thread here or in the Pen Review forum section. By doing it this way, it will help make this a useful reference source on these pens as you won't have to wade through lots of posts to find the info about these pens. Hope this is clear and makes sense. Thanks for looking. Feel free to PM me with any questions or concerns about this approach, etc.... Mark

I am one of the DuPont fans. My pens to date have been D-line, Orpheo, Fidelio, neo-classique. I have just acquired my first Montparnasse, a new old stock LE Rendez-vous Sun. A truly stunning piece of art! I would now like to add another and have been looking at ebay. The size issue confuses me. I know that these pens came in a large size and smaller. On ebay, some pens are designated M1, M2, large, or XL. Is it possible to tell the large size from a photo without having dimension data? I have looked at the reference pages on this site but I could find no information about the various M1, M2, etc designations. Any information would be greatly appreciated! Thanks!

I am a new owner of a Dupont Montparnasse. The feed seems to be of a unique design. There are none of the typical slots that function as ink reservoirs to deal with pressure changes, nor does the nib have the usual breather hole through which you can view the feed slot. Do any of the Dupont experts out there clarify how this manages to deal with pressure changes, ie, is there an alternative to the slots? Thanks for any info!

Having a mild interest in adding another Classique to my S T Dupont pens, I came across an advertiser in the land of Oz, offering a Classique and a Montparnasse, as well as a whole bunch of other much more expensive pens. The advertiser has a good seller rating and many followers. He offers a 30-day money back guarantee, and said that all goods were owned by him, collected over many years. However (and leaving aside all matters of price), my caution came from the fact that the "Montparnasse" is quite obviously not. Neither pen comes with box or papers, yet of the "Montparnasse" (it looks to me like a Classique) he said it had been dipped only, never used. This seemed odd. If you buy a pen and dip it only, it seems less likely to me that you would also discard or lose the box and papers. I wrote and asked about this. While I was at it, I asked whether my Waterman converter would fit or whether I would need an international converter *. This was the reply, which I think it reasonable to publish here: "I have no idea if the converter will fit or not. It takes common cartridges so writing with it is no problem. I used to travel a lot when I was working overseas. Every time I was near a duty free e.g. Hong Kong, Schipol in Amsterdam etc I tended to pick up a pen as I did collect them. In a hand luggage that would have been the first thing to throw away the box. I never thought I would sell my pens so they have been in a display case for years. Now I am old and have no use for them. I know they are genuine because they were mostly from authorised Airport Duty Free shops around the world. Hope this clears." I do not intend to buy from this seller. I have better options, assuming I do anything at all. However, I am interested in considered views. Reputation and story on one hand, obvious error and the explanation on the other. * I am quite aware that Duponts up to the Montparnasse take neither of these converters. edit:typo