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First versions were made ​​of hard rubber, and there are also [[overlay]] versions in gold rolled metal. The initial production was certainly very small, since have been found handwritten guarantee scraps dated [[1933]], signed individually by the  ''Dante Zerollo''. This first production was followed by new celluloid versions, made ​​in beautiful marbled colors or wood grain, and with extremely refined working as a peculiar spiral faceting.

First versions were made ​​of hard rubber, and there are also [[overlay]] versions in gold rolled metal. The initial production was certainly very small, since have been found handwritten guarantee scraps dated [[1933]], signed individually by the  ''Dante Zerollo''. This first production was followed by new celluloid versions, made ​​in beautiful marbled colors or wood grain, and with extremely refined working as a peculiar spiral faceting.

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>

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