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This "system" was found exclusively on Japanese pens, and can be considered a variant of the [[plunger filler]] of the [[Onoto]], from which it was probably inspired. On a mechanical level, in fact, the mechanism is essentially identical, but in this case it is not used to fill the pen, but only to block the flow of ink to the nib when the pen is closed. It is not known an inventor of this mechanism, that it is found on around all Japanese pens produced until the years '30 from companies like the [[Pilot]] and the [[Sailor]].

This "system" was found almost exclusively on Japanese pens, and can be considered a variant of the [[plunger filler]] of the [[Onoto]], from which it was probably inspired. On a mechanical level, in fact, the mechanism is essentially identical, but in this case it is not used to fill the pen, but only to block the flow of ink to the nib when the pen is closed. It is not known an inventor of this mechanism, that it is found on around all Japanese pens produced until the years '30 from companies like the [[Pilot]] and the [[Sailor]].