The European Central Bank has launched an investigation after counterfeit €50 notes were advertised for sale on the internet.
The notes were being offered in bundles of 21, for a price of €50, by a British printing company.
The website in question claimed the fake notes were ordered for use in a Hollywood blockbuster movie that has since been abandoned.
It was selling 2,000 bundles, each comprising of 21 counterfeit notes, for €50.
A disclaimer on the website said the notes should only be used for entertainment purposes.
This follows a claim that the counterfeit currency is so good, some banks could not spot them as being fake.
The European Central Bank says it is treating the possibility that counterfeit notes are being sold online very seriously.
It has launched an investigation as to whether the strict reproduction rules governing euro banknotes have been broken and says it will follow up its inquiries by contacting the relevant national authorities.
The website advertising the counterfeit banknotes now states that it is currently unable to process any further purchases.
