Modifiche

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 a research on nibs and clips by Luca De Ponti.</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 a research on nibs and clips by Luca De Ponti.</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 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.

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.