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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.  

Initially the [[Dunn]] pens were made in [[hard rubber]] and were of good quality; the company distinguished itself by an extensive advertising campaign. The pump mechanism was simple and robust, and the pens were produced in a variety of models from small pens for women's to the [[Dreadnaught]] giant model (produced also in regular dimensions). An interesting feature, from a technical point of view, was also the introduction of a the caps composed by two parts, whose top section could be unscrew in order to discover the nib, but leaving it shielded by a protective cage in order to consent to fill the pen without pressing dangerously the nib on the bottom of the ink bottle.

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