It's a bulb filler with a mechanical means of depressing the bulb. Also,you claim that it was the first pen to use a vacuum-type approach to fill a pen with ink. Sac-fillers, plunger-fillers and piston-fillers all operate by creating a vacuum which fills with ink. I don't dispute that it's the first see-through pen.
Aren't fountain pens more and more "looking back" rather than forward? And has design and technology of fountain pens not become rather anachronistic in this day and age? So I am not surprised that there are no newer breakthrough pens - just like timepieces they have become a rather whimsical toy and status symbol. So I think we can at least drop the search after 1970 (that's the Hastil...).
Interesting thread. I don't know anything about pen history.
It should be noted Aurora only reintroduced slim pens, many early eyedroppers where very slim. Probably significant enough in it's own right but more significant than say the Sheaffer Snorkel is a big call. The Parker 45 was a pretty significant milestone too imo and the rather pedestrian Sheaffer School pen probably deserves more recognition but maybe not in this list.
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