Modifiche

[[Parker]] continued to produce ebonite pens with good results, focusing on the functionality of his pens and on the benefits of the [[button filler]], but the real breakthrough came in 1921 with the launch of [[Duofold]], which was a huge success, by getting the company at the top of sales. The creation of a large pen, made ​​of hard rubber of a bright red color, was a revolution in the foutain pen world until then dominated by the black color, and foreshadowed the introduction of the celluloid colors by several years.  

[[Parker]] continued to produce ebonite pens with good results, focusing on the functionality of his pens and on the benefits of the [[button filler]], but the real breakthrough came in 1921 with the launch of [[Duofold]], which was a huge success, by getting the company at the top of sales. The creation of a large pen, made ​​of hard rubber of a bright red color, was a revolution in the foutain pen world until then dominated by the black color, and foreshadowed the introduction of the celluloid colors by several years.  

Il successo della [[Duofold]], nonostante il suo prezzo (10 dollari) fosse elevato per l'epoca, proseguì per oltre un decennio, in cui i modelli vennero rivisti più volte, adeguandoli alla introduzione di nuovi materiali come la celluloide o alla moda delle forme affusolate con i modelli ''[[Streamlined]]''. Nel 1923 venne aperto un impianto in Canada, e venne introdotto il modello da donna [[Duofold|Lady Duofold]]. Nel 1926 anche la [[Parker]] iniziò a passare la produzione dall'ebanite alla celluloide.

The success of the [[Duofold]], despite its price (10 dollars) was high for the time, continued for over a decade in which the models were revised several times, adjusting the production to the introduction of new materials such as celluloid or the new ''[[Streamlined]]'' style with tapered models. In 1923 was opened a plant in Canada, and was introduced a women [[Duofold|Lady Duofold]] model. In 1926 also the [[Parker]] began to move production from ebonite to celluloid.

[[Image:Parker-Duofold-VestsPocket-Serie.jpg|thumb|All color for ''[[Vest pocket]]''  [[Duofold]].]]

[[Image:Parker-Duofold-VestsPocket-Serie.jpg|thumb|All color for ''[[Vest pocket]]''  [[Duofold]].]]