FABER CASTELL CASTELLO MIT VENTILTANK FOUNTAIN PEN - DEMONSTRATOR
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Demonstrator fountain pens are intentionally made with transparent bodies to show their mechanisms to customers.
In the past, some salesmen carried this and show demonstrators to potential customers to explain how their fountain pens work and to induce to buy them.
Their transparent bodies, however, quite lovely by their nature, so demonstrator fountain pens are sold as they are in these days.
They lost their role these days, but they survived with their own beauties.
To Faber Castell, demonstrator fountain pens were not that common.
Although my short knowledge can never cover the all Faber Castell pens, what I've seen until now are demonatrator fountain pens of Gentleman, Progress 77, and this MIT ventiltank.
The original version of MIT ventiltank is here, so you might refer this post if you want.
The cap needs not to be clear, so the cap is the same as the usual one.
"Castello MIT ventiltank."
Castello is a series that mostly focused on cheap models and school fountain pens, except for the 14k gold nib version. (Castello gold)
"VORFÜHRMODELL, MIT ATTRAPPENFEDER"
"Demo model with dummy spring"
Unlike Gentleman and Progress fountain pens, this model deserves a demonstrator since this model mounted a new function.
The function of "ventiltank" is described in detail in the original post, so let me briefly remind you what it is.
The ventiltank is filled during one fills the ink in the converter.
Then, the tank keeps the ink, and one can use this spare ink in case of exhausting all the ink.
To emit the stored ink from the ventiltank, one needs to align two semicircles at the end of the pen.
Afterwards, the user needs to rotate them in the original state.
In sum, this fountain pen equips a reservoir for the ink, and this can be used for emergency.
Since it is a demonstrator fountain pen, one might figure out how this works.
The nib size is quite big.
Faber Castell bicolor nib with Osmia's diamond logo.
This nib was used for high-class models like 884 fountain pen.
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