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The last series produced in celluloid, the [[Columbus 90]] was introduced approximately in 1951, and made both as [[piston filler]] or with a special [[button filler]] with the bottom back not removable, similar to the ''[[push-knob]]'' of [[Montblanc]]. The production of the '50s saw the abandonment of celluloid for the use of cheaper molded plastic, and the production of [[Columbus Anni '50|models]] with [[hooded nib]] and cheap plastic pens for the student market.

The last series produced in celluloid, the [[Columbus 90]] was introduced approximately in 1951, and made both as [[piston filler]] or with a special [[button filler]] with the bottom back not removable, similar to the ''[[push-knob]]'' of [[Montblanc]]. The production of the '50s saw the abandonment of celluloid for the use of cheaper molded plastic, and the production of [[Columbus Anni '50|models]] with [[hooded nib]] and cheap plastic pens for the student market.

Nel 1957 il fondatore morì lasciando l'azienda in mano al figlio Enrico, ma ormai il mercato delle penne stilografiche era in completo declino a causa della diffusione della penna a sfera, la scelta fu quella di rivolgersi alla produzione di penne di fascia medio bassa e per il mercato scolastico, ma l'azienda subì un inesorabile declino. Nel 1992 i resti dell'azienda ed il marchio [[Columbus]] vennero venduti alla ''Santara Srl'' che ancora oggi produce penne moderne con questo nome.

In 1957 the founder died, leaving the company in the hands of his son Enrico, but at that time the fountain pen market was drastically shrinking due to the spread of the ballpoint pens. The choice was towards the production for the school and the low end of the market, but the company suffered an inexorable decline. In 1992 the company renmants and the [[Columbus]] trademark were sold to ''Santara Srl'' that is still producing some modern pens under the same brand.

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