Demonstrator pen

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A demonstrator pen is a pen which has a clear section as a considerable part of its body, where the user can view the pen's inner workings. Demonstrator pens are often used to show that a pen has a large ink supply, etc. It is for these reasons that demonstrator pens were once used for marketing purposes. However, some modern demonstrator pens are also sold for stylistic purposes – a demonstrator version of the Lamy Safari was released as the Vista.