0 Euro Bundeshauptstadt Berlin

The zero-euro souvenir note program was launched in France in 2016 by Richard Faille's company, which licensed the European Central Bank's security specifications — including the Oberthur-printed substrate — to produce legally valid collector pieces with a face value of nothing. The ECB formally tolerated the scheme on the condition that no denomination above zero appear, neatly sidestepping counterfeiting law while creating a category of currency-adjacent paper that neither circulates nor inflates.

Oberthur's involvement is the real story here: the same printer responsible for genuine euro banknotes for multiple member states produced these souvenirs on equivalent security paper, with UV features and microprinting intact.