1934-1941 Parker Challenger, Pencil, Green and Black marbled Propel/repel 1.1mm lead
Parker Pens Penography: CHALLENGER. he Challenger was a school pen that was first introduced in the february 1934 Parkergram, during the Vacumatic era. It was a button filler and was made out of the same plastic as the early marbled Vacumatics. ... "chunky" feel, as opposed to the finer marbled plastics of the Standard.