It is best known for marketing in [[1932]] the [[Duocolor]], a double pen allowing you to either use two separated pens loaded with different colors. This pen is identical to [[Zerollo]] and in essence is nothing more than a rebranding of the Genoese company products. | It is best known for marketing in [[1932]] the [[Duocolor]], a double pen allowing you to either use two separated pens loaded with different colors. This pen is identical to [[Zerollo]] and in essence is nothing more than a rebranding of the Genoese company products. |