Fisher Bullet Ballpoint Lime GreenA Man, and a Pen, on a Mission A proponent of the scientific method, Paul Fisher introduced his chrome Bullet Pen in 1948. His innovative thinking led to the development of the Space Pen in the 1960s. With its pressurized ink cartridge, it could write upside down, under water, through grease and in zero gravity vacuum of outer space. Since its introduction, the Space Pen has been on board every American and Russian space mission. Choose your Bullet