The first new hue was the now traditional red, followed by Jade green (made to compete with Sheaffer's revolutionary Jade Radite Lifetime pens) which was not originally referred to as a Duofold, but rather the Black Tipped Jade (changed shortly thereafter).This was followed by Lapis Lazuli blue and Mandarin Yellow.Matching pencils would come with either clip or ring, depending on the pen selected.The pen was available only in black and red hard rubber until 1926, when Parker introduced the “unbreakable Permanite” Duofold (Permanite was Parker’s trade name for a plastic manufactured by Du Pont).Both were introduced by Parker into their highly successful 51 line of pens in 1949, as aerometric fillers.I have restored, and written about, many vacumatic and aerometric 51s over the past six years.The Parker Duofold is a range of fountain pens produced by the Parker Pen Company.
Without getting into the legal details, it is my understanding that Parker initially named this pen the Signet, and due to this name already being used by another fountain pen, they changed the name to Insignia.
In 1928, Moderne black and pearl (black lined pearl) was introduced as a Deluxe model and Parker signified this by the addition of a third cap ring to the cap band instead of the usual two found at the time.
In 1930 the Duofold line was streamlined with tapered ends replacing the familiar “flat-top” style.
In 1988 (to celebrate the company's centennial), Parker launched the Duofold Centennial series of Pens (Fountain Pens, Rollerballs and Pencils).
Later, they introduced the Duofold International line with models that also evoked the classic Duofold design, though smaller than the Centennial.
This pen is gray and with aging is has developed a greenish tinge...