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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.

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.

In 1922 Umberto Vecchietti died, leaving the company in the hands of his wife, Ada Corazza Vecchietti, who brought forward the opening, in 1928, of the historic shop in Via Marconi 6, still run by the family. In 1930, Umberto's son, Alfonso, succeeded his mother in running the company, carried on until the 50s closing.  

Nel 1922 Umberto Vecchietti morì, lasciando l'azienda nelle mani della moglie, Ada Corazza Vecchietti, che la portò avanti aprendo, nel 1928, lo storico negozio di Via Manzoni 6, rimasto aperto per 83 anni prima del trasferimento nella nuova sede attuale, ed ancor oggi gestito dalla famiglia. Nel 1930 il figlio di Umberto, Alfonso, subentrò alla madre nella conduzione dell'azienda, portata avanti fino alla chiusura della stessa negli anni '50.  

Around the mid '20s [[Nettuno]], like all other Italian brands, began a production of [[Duofold]] imitations, which at the time was the stylistic reference for all Italian manufacturers. In this case the [[button filler]] was also adopted, and these [[Nettuno Flattop|models]], apart from the incision of the ''Nettuno'' name on the clip, are substantially identical to the [[Parker]] original model, both for the ball clip, than for the shape of the body, cap and bottom. In the 30s, continuing to follow [[Duofold]] evolution,  were produced new models in ''[[streamlined]]'' version, and was also introduced a new clip with a  spatula shaped termination.

Around the mid '20s [[Nettuno]], like all other Italian brands, began a production of [[Duofold]] imitations, which at the time was the stylistic reference for all Italian manufacturers. In this case the [[button filler]] was also adopted, and these [[Nettuno Flattop|models]], apart from the incision of the ''Nettuno'' name on the clip, are substantially identical to the [[Parker]] original model, both for the ball clip, than for the shape of the body, cap and bottom. In the 30s, continuing to follow [[Duofold]] evolution,  were produced new models in ''[[streamlined]]'' version, and was also introduced a new clip with a  spatula shaped termination.