The makers of this pen used to advertise all over the place when the pens first came on the market several decades ago. Now you have to do a Google search to find them. At least I did.
They called them “Space Pens” because; on some early NASA space flights they discovered that your basic, every day ball point pens didn’t work very well. Everything was weightless, including the ink inside the pen, and it wouldn’t flow onto the page. Apparently, in those early days of space travel, the Astronauts took a lot of notes. Or maybe they whiled away the long hours in orbit by connecting the dots or doing crossword puzzles.
Faced with this dilemma the brilliant minds set to work hunting for a solution. They found one.