Oxenaar gave everyone the finger
On the member forum of the IBNS website, I found a link to a great interview with Ootje Oxenaar, the designer of one of the most beautiful banknote series the Netherlands has ever seen. It provides some insight in the development of a new banknote series as well as great anecdotes on specific notes. Like the 1000-gulden note shown here in which Oxenaar hid a etching of his own fingerprint... from his middle finger 
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You can also check this video in which he talks about designing the Dutch banknotes.
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