The head of the European Central Bank (ECB), Mario Draghi, has unveiled the new €20 banknote in Frankfurt.

It will go into circulation on November 25th, to allow for an extended period for manufacturers, cash handlers and others to prepare for it.

The new note includes a new 'portrait window' security feature. This means when it is held against the light, the window becomes transparent and reveals a portrait of the figure Europa.

This will be visible on both sides of the note.

Image: Central Bank of Ireland

The new banknote - like the new €5 and €10 notes - also includes an emerald number and a portrait in the watermark.

There is also raised print - meaning the main image, the lettering and the large value numeral feel thicker.

ECB President Draghi said: "The portrait window is a real innovation in banknote technology. It is the outcome of the Eurosystem's work to ensure that the euro notes continue to be resilient against counterfeiting."

"This will reinforce the trust that the 338 million citizens across the euro area place in their banknotes," he added.

The €20 note is one of the most widely used of all the Euro banknote denominations.

A close-up of the Europa watermark | Image: ECB

See how the note is produced, in this footage from the ECB: