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But [[Parker]] was not the first manufacturer to use these new materials, well before the official launch of [[51]], in 1939, [[Waterman]] launched the [[Hundred Year]] model, also produced with the same material, [[Lucite]], which was probably the first major model produced in plastic resin. Another great success plastic resin model was the  [[Eversharp]] [[Skyline]], made in [[polystyrene]]. Since the '50s, most manufacturers began to abandon [[celluloid]], which until then was the dominant material, to switch to the use of different kind of plastic resins.

But [[Parker]] was not the first manufacturer to use these new materials, well before the official launch of [[51]], in [[1939]], [[Waterman]] launched the [[Hundred Year]] model, also produced with the same material, [[Lucite]], which was probably the first major model produced in plastic resin. Another great success plastic resin model was the  [[Eversharp]] [[Skyline]], made in [[polystyrene]]. Since the '50s, most manufacturers began to abandon [[celluloid]], which until then was the dominant material, to switch to the use of different kind of plastic resins.