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[[Image:Colorado-Ringed-Grey-Open.jpg|thumb|A ringed ''Colorado'']]
 
[[Image:Colorado-Ringed-Grey-Open.jpg|thumb|A ringed ''Colorado'']]
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The ''Colorado'' brand distinguishes, rather than a company, a single pen. For long time these pens, because of the filling system (a so called "[[stantuffo tuffante]]"), were attributed to [[Omas]] but they are from a completely independent brand, linked to the activities of ''Orlando Quadretti'' who also holds the trademark registration ({{Marchio|75447}}). <ref>as described in the Letizia Jacopini book, this attribution is due to the Gian Stefano Germano work, who attribute it to him in the book "Storia Universale della Stilografica", and is confirmed by the direct testimony of the son of Orlando Quadretti and by the documents on the registration of Trademarks of the ''Archivio Centrale dello Stato''.</ref>   
The [[Colorado]] brand distinguishes, rather than a company, a single pen. For long time these pens, because of the filling system (a so called "[[stantuffo tuffante]]"), were attributed to [[Omas]] but they are from a completely independent brand, linked to the activities of ''Orlando Quadretti'' who also holds the trademark registration ({{Marchio|75447}}). <ref>as described in the Letizia Jacopini book, this attribution is due to the Gian Stefano Germano work, who attribute it to him in the book "Storia Universale della Stilografica", and is confirmed by the direct testimony of the son of Orlando Quadretti and by the documents on the registration of Trademarks of the ''Archivio Centrale dello Stato''.</ref>
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The creation of the pen is linked to the activities of the Quadretti store, dating from 1938-39, which specialized in the sale of fountain pens, and the prototype of the pen, still in possession of the heirs, was built around the [[1939]]. At that time it was in vogue the trend of "double" pens (launched by the [[Zerollo]] and continued with other models such as the [[Itala]]) able to write with two different colors.  
 
The creation of the pen is linked to the activities of the Quadretti store, dating from 1938-39, which specialized in the sale of fountain pens, and the prototype of the pen, still in possession of the heirs, was built around the [[1939]]. At that time it was in vogue the trend of "double" pens (launched by the [[Zerollo]] and continued with other models such as the [[Itala]]) able to write with two different colors.  

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