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The pen, made in [[celluloid]] is known to be made in black (the most common version) and in ringed versions in gray and red/brown or mottled (gray and brown). The production took place, however, in its own even if the nibs were purchased from a company in Bologna, with the "''Quadretti''" imprint. The production, however, given the rapid passing of the trend, was rather small, both in terms of numbers and in length of time, which makes the pen quite rare.  

The pen, made in [[celluloid]] is known to be made in black (the most common version) and in ringed versions in gray and red/brown or mottled (gray and brown). The production took place, however, in its own even if the nibs were purchased from a company in Bologna, with the "''Quadretti''" imprint. The production, however, given the rapid passing of the trend, was rather small, both in terms of numbers and in length of time, which makes the pen quite rare.  

Although the ''Colorado'' is the only model with this name, is known a further "''Quadretti''" production of some celluloid pens equipped with ordinary nib marked themself "''Quadretti''", probably dating back to the early 40s. The production seems to have been permanently discontinued after the war.

Although the [[Colorado]] is the only model with this name, is known a further "''Quadretti''" production of some celluloid pens equipped with ordinary nib marked themself "''Quadretti''", probably dating back to the early 40s. The production seems to have been permanently discontinued after the war.

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