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<noinclude>The ''eyedropper filler'', also called ''drop filler'' is the first filling system used in fountain pens and in reality it cannot be considered even a real filling system, since in essence there is no ''"system"''.

<noinclude>The ''eyedropper filler'', also called ''drop filler'', is the first filling system used in fountain pens and in reality it cannot be considered even a real filling system, since in essence there is no ''"system"''.

In this case, in fact, the pen is filled by removing the nib assembly from the barrel, which is used directly as a tank. The refill operation is carried out, once the access to the tank has been obtained, with the introduction of ink to be carried out usually with a dropper, which in the original versions was supplied by the manufacturer together with the pen. Once the refill was completed, the nib assembly had to be reassembled on the barrel in order to use the pen.

In this case, in fact, the pen is filled by removing the nib assembly from the barrel, which is used directly as a tank. The refill operation is carried out, once the access to the tank has been obtained, with the introduction of ink to be carried out usually with a dropper, which in the original versions was supplied by the manufacturer together with the pen. Once the refill was completed, the nib assembly had to be reassembled on the barrel in order to use the pen.