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[[Image:1933-12-Zerollo.jpg|thumb|left|A ''Zerollo'' advertising from 1933.]]
[[Image:1933-12-Zerollo.jpg|thumb|left|A ''Zerollo'' advertising from 1933.]]
Filling the pens is done with the principle of the [[match-stick filler]] through two small holes on the body, which, when the pens are in theirs rest position, provide access to the pressure bars that allow to wring the sacs placed internally of both pens, that contain the ink. In this case it is not necessary to obtain a match-stick, given that the head of the cap mounts inside a thin metal shaft suitable for the purpose. Therefore you simply need to unscrew it and use it as a handle to push through the holes in the side.
Filling the pens is done with the principle of the [[match-stick filler]] through two small holes on the body which, when the pens are in theirs rest position, provide access to the pressure bars that allow to wring the grommets placed internally of both pens, that contain the ink. In this case it is not necessary to obtain a match-stick, given that the head of the cap mounts inside a thin metal shaft suitable for the purpose. Therefore you simply need to unscrew it and use it as a handle to push through the holes in the side.
First versions were made of hard rubber, and there are also [[overlay]] versions in gold rolled metal. The initial production was certainly very small, since have been found handwritten guarantee scraps dated [[1933]], signed individually by the ''Dante Zerollo''. This first production was followed by new celluloid versions, made in beautiful marbled colors or wood grain, and with extremely refined working as a peculiar spiral faceting.
First versions were made of hard rubber, and there are also [[overlay]] versions in gold rolled metal. The initial production was certainly very small, since have been found handwritten guarantee scraps dated [[1933]], signed individually by the ''Dante Zerollo''. This first production was followed by new celluloid versions, made in beautiful marbled colors or wood grain, and with extremely refined working as a peculiar spiral faceting.