As Commander of the Thunderbirds, Lt. Colonel Ron Mumm asked Paul Fisher to design a pen with a "gripping knob" to allow easy removal and replacement from the small, lower leg pocket of the pilots' flight suits. Today, this pen is the official writing instrument of Thunderbirds pilots. The Thunderbirds logo sits atop the gripping knob of the pen. Otherwise it's a regular AG7 model pen as used on all the manned space flights.
The T7 is made from solid brass with an extremely hard chrome plating; it is a heavy pen, with the weight resting reassuringly in your hand as you write. It has a very positive and substantial feeling click mechanism, with a plunger on the top for extending the refill, as well as a unique side release button to retract it. Its special design helps to ensure that you will always remember to retract the point before you slide it back into your pocket.
Containing a Fisher Space Pen® Pressurized Ink Refill Cartridge, theT7 will write upside down - at any angle, under water, through grease, in extreme temperatures (-30 to +250 degrees F), on almost any surface, three times longer than the average pen, and of course, in the gravity free vacuum of space.
All Fisher Space Pens are lifetime guaranteed for quality against all manufacturing defects - American Technology