Fisher Space Pen Bullet Black Matte Pressurized Space Pen NASA

In like new condition, box is a little worn as pictured. Fisher Space Pen Bullet Black Matte Pressurized Space Pen NASA.

The Fisher Space Pen
After rigorous testing, in 1967, NASA selected the Fisher Space Pen for use on the Apollo Missions.
They are now used on all manned space flights - American and Russian.
The Space Pen technology starts with a non-skip, textured tungsten-carbide ball encased in a stainless steel ball socket, designed and machined to almost perfect precision.
The sealed
ink cartridge is
pressurized at about 45 pounds per square inch

pounds per square inch and contains a visco-elastic, thixotropic, solid-gel ink.
The result is a ballpoint pen that will
write
dependably smooth upside down, underwater, over grease, in extreme cold and hot temperatures, with an estimated shelf-life
Material: Brass
Finish: Powder Coated
Length: Open 5.35"; Closed 3.77"
Diameter: .38"
Cartridge: Fisher PR4, Black Ink, Medium Point;
Packaging: Moonscape Gift Box with Astronaut Sleeve