Fisher SPACEPEN B1 Original Shuttle Style Pen NASA Writes Underwater New in Box

Fisher SPACEPEN B1 Original Shuttle Style Pen NASA Writes Underwater New in Box
the only ball pen used on the moon
the only ball pen that writes UP... without stopping
Ultra-hard tungsten carbide ball
Sliding float separates ink from gas
Gas plug
Stainless steel, precision-machined delivers instant uniform ink flow.
Thixotropic ink in hermetically sealed and pressurized reservoir writes 3 times longer.
Ink will not dry out in 100 years!
Writes under water and over grease at-50° to + 400°