Modifiche

[[File:Zerollo-Small-Lady-LightBlueStriated-Open.jpg|thumb|A [[Zerollo]].]]

[[File:Zerollo-Small-Lady-LightBlueStriated-Open.jpg|thumb|A [[Zerollo]].]]

[[Zerollo]] produced substantially only one model, albeit in a considerable number of variants, called [[Zerollo|Duo Color]] precisely by its characteristics of being made by two internal separate pens allowing to write in two different colors. The mechanism, which incorporates the technology used on the classic [[safety]] pens is extremely sophisticated and bears close tolerances, which makes the pen rather weak in terms of mechanical stability. Through an ingenious screw system, the two pens, which are separated by a metal plate attached to the bottom that makes them rotate, are slidnf in opposite directions by means of grooves made ​​in the body of the pen, and brought alternately inside and outside the body according to the direction in which you rotate the cap.  

[[Zerollo]] produced substantially only one model, albeit in a considerable number of variants, called [[Zerollo|Duo Color]] precisely by its characteristics of being made by two internal separate pens allowing to write in two different colors. The mechanism, which incorporates the technology used on the classic [[safety]] pens is extremely sophisticated and bears close tolerances, which makes the pen rather weak in terms of mechanical stability. Through an ingenious screw system, the two pens, which are separated by a metal plate attached to the bottom that makes them rotate, are sliding in opposite directions by means of grooves made ​​in the body of the pen, and brought alternately inside and outside the body according to the direction in which you rotate the cap.  

To write is necessary to completely extract one of the two pens from the body, bringing the other inside. In the rest position instead the two pens must be placed at the same height remaining partially protruding from the front opening, and only in this position it is possible to close the pen putting the cap and refill them. The cap has in fact only the purpose of protection of the tips of two pens, since the ink is not contained in the barrel body but in the individual pens that are housed in it.

To write is necessary to completely extract one of the two pens from the body, bringing the other inside. In the rest position instead the two pens must be placed at the same height remaining partially protruding from the front opening, and only in this position it is possible to close the pen putting the cap and refill them. The cap has in fact only the purpose of protection of the tips of two pens, since the ink is not contained in the barrel body but in the individual pens that are housed in it.

Given quality and sophistication of the processes, and the presence of similar celluloid, it has been suggested that the production of these pens have been entrusted to the [[OMAS]], but there is no proof, or reference document in this regard that let support this hypothesis, and the similarity or the quality of the work can not be considered a final element, as it can be assumed that [[Zerollo]] could have purchased some parts from [[OMAS]].<ref>in [http://www.fountainpennetwork.com/forum/index.php?showtopic=4467&st=0 & # entry116468 this article] is cited research by Luca De Ponti on nibs and clips.</ref>

Given quality and sophistication of the processes, and the presence of similar celluloid, it has been suggested that the production of these pens have been entrusted to the [[OMAS]], but there is no proof, or reference document in this regard that let support this hypothesis, and the similarity or the quality of the work can not be considered a final element, as it can be assumed that [[Zerollo]] could have purchased some parts from [[OMAS]].<ref>in [http://www.fountainpennetwork.com/forum/index.php?showtopic=4467&st=0 & # entry116468 this article] is cited research by Luca De Ponti on nibs and clips.</ref>

The company had some success, and was able to sell its products abroad relying on [http://en.wikipedia.org/wiki/Alfred_Dunhill Dunhill] for the English market and on [[Unic]] for the French one. But although functional it was still a pen equipped with a very complex and delicate mechanical system, difficult to repair, which made it brittle and all in all not much more convenient to use than the simple and straightforward solution to carry around two pens. While maintaining production based only on this particular model, and not being able to produce further innovation, with the fall of the interest aroused in the initial period, [[Zerollo]] suffered a progressive decline disappearing from the market after the Second World War.

The company had some success, and was able to sell its products abroad relying on [http://en.wikipedia.org/wiki/Alfred_Dunhill Dunhill] for the English market and on [[Unic]] for the French one. But although functional it was still a pen equipped with a very complex and delicate mechanical system, difficult to repair, which made it brittle and all in all not much more convenient to use than the simple and straightforward solution to carry around two pens. While maintaining production based only on this particular model, and not beeing able to produce further innovation, with the fall of the interest aroused in the initial period, [[Zerollo]] suffered a progressive decline disappearing from the market after the Second World War.

For the particularity of his fountain pens, combined with the lack of production and even more limited availability of working models, a [[Zerollo]] is among the most collectible fountain pens models, reaching high prices, even if the historical importance of the company, especially in relation to the international scene, is relatively marginal.

For the particularity of his fountain pens, combined with the lack of production and even more limited availability of working models, a [[Zerollo]] is among the most collectible fountain pens models, reaching high prices, even if the historical importance of the company, especially in relation to the international scene, is relatively marginal.