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The ''Dunn'' pens were primarily [[hard rubber]] made; and the company distinguished itself with an extensive advertising campaign. The pump mechanism was simple and robust, and pens were produced in a variety of models from small ladies pens (the [[Hummingbird]]) to the giant [[Tanks]] model, which is sometimes called [[Dreadnaught]] by collectors, although this name rather distinguishes a series that was also produced in ordinary sizes, characterized by caps composed of two parts (another interesting technical innovation, covered by the patent {{Cite patent|US|1596722}}) whose upper section could be unscrewed to reveal the nib but leaving it protected by a protective cage, so you can fill the pen without pressing the nib dangerously on the bottom of the ink bottle.  

The ''Dunn'' pens were primarily [[hard rubber]] made; and the company distinguished itself with an extensive advertising campaign. The pump mechanism was simple and robust, and pens were produced in a variety of models from small ladies pens (the [[Hummingbird]]) to the giant [[Tanks]] model, which is sometimes called [[Dreadnaught]] by collectors, although this name rather distinguishes a series that was also produced in ordinary sizes, characterized by caps composed of two parts (another interesting technical innovation, covered by the patent {{Cite patent|US|1596722}}) whose upper section could be unscrewed to reveal the nib but leaving it protected by a protective cage, so you can fill the pen without pressing the nib dangerously on the bottom of the ink bottle.  

In addition to black [[hard rubber]], Dunn produced pens with transparent barrel; these were initially made in [[bakelite]] and later in [[celluloid]]. This feature allowed it to boast (rightly) to be the only transparent pen (in the ads showing the model called [[Camel Tatler]]) to display the ink level, and this well 10 years before the [[Vacumatic]]. Are also known to exists, but to be very rare, some metal [[overlay]] pens.  

In addition to black hard rubber [[Dunn]] produced also [[bakelite]] pens with a transparent barrel (though most of the transparent models were later made in [[celluloid]]) boasting (rightly) of being the only transparent pen (with the model named [[Camel Tatler]]) to display the ink level, and a good 10 years before the [[Vacumatic]]. Are also known to exists, but to be very rare, some metal [[overlay]] pens.

The end of the company is not very clear, someone report a bankruptcy in [[1924]] caused by a prolonged strike of all the employees. Others say that the company continued operation until [[1927]], because there are trace of it having headquarters in New York, 71 Fifth Ave, when it went off market by its incapacity to adapt its production to the era of the colored celluloid pens. It seems<ref>look at this [http://www.fountainpennetwork.com/forum/index.php?s=ad059a9e060d5ae6fba92e02ec66b7d5&showtopic=53123 discussion] about this topic in Fountain Pen Network.</ref> that in 1924 there was a first instance of failure (whose causes seem to be specifically tied if not for a strike to serious problems of labor relations), which was followed by an attempt to reorganize the company with a re-foundation and a different location from the original in order to avoid debtor lawsuits. This was unsuccessful, leading a few years later to the final bankruptcy.

The end of the company is not very clear, someone report a bankruptcy in [[1924]] caused by a prolonged strike of all the employees. Others say that the company continued operation until [[1927]], because there are trace of it having headquarters in New York, 71 Fifth Ave, when it went off market by its incapacity to adapt its production to the era of the colored celluloid pens. It seems<ref>look at this [http://www.fountainpennetwork.com/forum/index.php?s=ad059a9e060d5ae6fba92e02ec66b7d5&showtopic=53123 discussion] about this topic in Fountain Pen Network.</ref> that in 1924 there was a first instance of failure (whose causes seem to be specifically tied if not for a strike to serious problems of labor relations), which was followed by an attempt to reorganize the company with a re-foundation and a different location from the original in order to avoid debtor lawsuits. This was unsuccessful, leading a few years later to the final bankruptcy.