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[[Image:BlueDiamond.jpg|thumb|left|150px|The ''[[Blue diamond]]'' for lifetime warranty.]]
[[Image:BlueDiamond.jpg|thumb|left|150px|The ''[[Blue diamond]]'' for lifetime warranty.]]
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.
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]], the first pen made of plastic resin (called ''[[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.
The [[51]] had a number of changes in the following years, such as switching in 1948 to a new the filling system called [[Caricamento#aerometric|aerometric]], the creation of different versions, including some luxury models in precious metals or with complex decorations for the metal cap. Some of these are extremely rare and highly sought after by collectors.
The [[51]] had a number of changes in the following years, such as switching in 1948 to a new the filling system called [[Caricamento#aerometric|aerometric]], the creation of different versions, including some luxury models in precious metals or with complex decorations for the metal cap. Some of these are extremely rare and highly sought after by collectors.