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There is damn little information anywhere on the actual mechanics of the "innovative ink-filling system called the Idrograph" other than some vague references to capillary action. Parker 61s used a capillary filling system with limited success but until someone can offer more specifics, we can only speculate on the Aurora filling system.
More interestingly, the fact that this is now the second drop for a New Old Stock pen in as many weeks, suggests that MD has found a new friend in the old pen business. Wonder what else is lurking down in that basement?
I am really confused by the filling system too, since whatever I can find indicated that this was a c/c pen, not an internal filling system or even a captured converter.
True, not many clues to go on, but I did find a site (in Italian) discussing the pen and action. Details were vague but I did get the impression it was a capillary filler.
It's possible the "Idrograph" was removable so the user could switch over to a proprietary converter or cartridge. If so, that would have been a solution to the Parker 61's short comings (once filled, it was impossible to empty completely, making it impractical to change ink colors).
We may never know--unless you buy one!
I bought one of these NOS several years ago, and mine is indeed a c/c pen.