Eagle Pen (c 1900) Cap and barrel black hard rubber. glass cartridge present with crack. Nib: Keyhole, fine marked "1451". All parts original. Measures: 4- 3/4" capped. Condition: Excellent. The origins of the Eagle Pen Company extend back the 1850s, initially as the Eagle Pencil Company, later the Eagle Pen and Pencil Company. Especially noted for a line of early glass-cartridge pens that were produced in the early 1900s.