In 1909 Parker presented the Jack Knife pen style fitted with an unmistakable cap top denominated by actual collectors as «Turban top», which is designed as a safety pen -a pen a lady can carry in her handbag without fear of ink soiling the contents.
This pen is used also by men who wish a short barrel end pen and maybe carried flat in the pocket or loose in the pants pocket.
The nozzle of the pen is made a trifle wider than in the regular pen and with a flat facing. The cap is fitted with a secondary cap that has a thread on the same and which turns easily inside the regular cap. When through using the fountain, screw on the regular cap down to the shoulder, then if it is desired to use the pen as a safety, give the secondary cap a turn, to bring its end facing in direct contact with the flat facing on the end of the nozzle. When the cap is removed, hold the pen point upward, so that any fluid that may be in the second cap will be drawn off by the pen point. Moisture will of course be in the little secondary cap, but it cannot escape into the other cap or around the nozzle so long as the foregoing is followed. This makes the simplest, neatest, and most practical safety pen on the market.
Made in these five sizes, if desired, could be fitted with fancy mountings at a special price.