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