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All [[Dunn]] fountain pens were produced using this particular filling system, which also characterized their style; the back of the pen, used as a knob of the [[stantuffo tuffante|pump filling system]] was carried out in red plastic (initially in hard rubber, then replaced by casein, a perishable and lower quality material), so it formed a distinctive feature of the pen, that in another slogan was described as ''The fountain pen with the red pump handle''.

All [[Dunn]] fountain pens were produced using this particular filling system, which also characterized their style; the back of the pen, used as a knob of the [[stantuffo tuffante|pump filling system]] was carried out in red plastic (initially in hard rubber, then replaced by casein, a perishable and lower quality material), so it formed a distinctive feature of the pen, that in another slogan was described as ''The fountain pen with the red pump handle''.

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 load the pen without pressing dangerously the nib 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.  

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). 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). Are also known to exists, but to be very rare, some metal [[overlay]] pens.