"Fountain pens filled with a lever that pressed down on a rubber sac, called the 'greishaber' pen, and over time the sacs that held the ink would rot and the pens would leak on the person's clothing. This was undesireable obviously, so my dad was trying to figure out a better way to fill a fountain pen. The Greishaber was an early fountain pen."
"The barrel of the (Graphomatic) pen was made of Lucite, after dupont invented lucite. And that eliminated the rubber sac that rotted all the time. The Graphomatic and Vacuumatic pens never leaked."
Sounds like there is some interesting innovation around using iridium instead of gold for some aspect of the pens also.
Anyhow... i did some googling for 'Sager Graphomatic' and found this forum. Thought maybe you all might find it interesting.
Cheers!

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