Centimeters. It is large enough (long enough) that millimeters are a bit small.
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a wide paper pen plotter
Thomas Jefferson used a quill pen to write the Declaration of Independence.
No one knows what the purpose for the stock pen, theories are that the stock pen was used for extra guns,gun powder etc.
The first patent ball point pen was made October 30, 1888 by Lewis Waterman but the first solid-ink fountain pen wasn't presented until 1907 by Parker Pen Company.
A simple answer is that a ballpoint pen could be carried on your person, so freeing you from having to carry a bottle of ink and a steel-nibbed dip pen.