0 Euro - Nausicaa

Nausicaä de Boulogne-sur-Mer, the largest aquarium in Europe by visitor numbers, became one of the early adopters of the EuroSouvenir program when it launched in 2015. The zero-denomination format was devised specifically to sidestep European Central Bank regulations prohibiting the private issuance of euro-denominated instruments with a stated value — hence the face value of exactly nothing.

Oberthur Fiduciaire produced these on genuine banknote paper with the same security printing infrastructure used for circulating currency, which is precisely the point: collectors pay for the paper, not the denomination.