0 Euro - Château de Breteuil

Château de Breteuil, a seventeenth-century estate in the Chevreuse Valley southwest of Paris, has been in the Breteuil family since 1712 and remains privately owned — one of relatively few grandes demeures in the Île-de-France to have survived both the Revolution and twentieth-century inheritance pressures intact. The zero-euro souvenir program, launched commercially around 2015 through EuroSouvenir, uses genuine Oberthur-printed banknote paper and incorporates standard security features, which gives these pieces their appeal to collectors despite carrying no monetary value.

Oberthur Fiduciaire has printed French banknotes since the nineteenth century, so the production credentials here are legitimate even if the instrument is not.