0 Euro - Napoléon les 100 jours March 20, 1815 - July 7, 1815

Souvenir euros of this type are legal tender in denomination only — the European Central Bank authorised the 0 euro note format in 2015 specifically to accommodate the collector and tourism market, with Oberthur Fiduciaire holding one of the few licensed mandates to produce them. They carry genuine security features, watermark included, precisely because counterfeiting a zero-denomination note would otherwise be trivially exploitable as a substrate for fraud.

The subject — Napoleon's return from Elba and the Hundred Days campaign, ending with his second abdication on June 22, 1815 — is a favourite of the series. Waterloo was fought on June 18.