Translations:Parker/22/en

Despite the commercial success and the good technical quality of its pens, the Parker continued to invest heavily in research and innovation, and in 1941 introduced a revolutionary model, the 51, between the first pens made ​​of plastic (Lucite) with a characteristic hooded nib, which is necessary for the use of a new quick drying ink (the Superchrome Ink), which tended to degrade the celluloid. The pen, although could not be considered particularly beautiful, and despite being built in ordinary plastic, was a tremendous success, and is probably the most sold fountain model of all time.