Paul Fisher developed the original bullet shaped pens almost 60 years ago. In July of 1948 Mr. Fisher machined the first bullet pen shaped from solid aluminium. Open, the Millennium Space Pen measures 5.5 inches, with a closed size of 4.2 inches. Bold Point with Black Ink. The Millennium Space Pen comes tucked inside a handsome leather case.The Millennium Space Pen has been guaranteed to write satisfactorily for your lifetime, without running out of ink.