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A first clear trace of fountain pens production originates to 1921, the registration date of the ''Penna Nettuno Sicurezza'' trademark ({{Marchio|21390}}), used for the production of pens made with either [[eyedropper filler]] or [[safety]]. The initial production is in fact fairly conventional, with smooth black hard rubber pens of different sizes ([[Nettuno 50x|502]], [[Nettuno 50x|504]], [[Nettuno 50x|506]], [[Nettuno 50x|508]]). In addition there were [[overlay]] pens in gold-plated metal.