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[[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.  
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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.
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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 [[Duofold|Lady Duofold]] model for women. 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]].]]