5 Euros - Henri I European Wildcat

Part of Luxembourg's ongoing national nature series, this issue was released under Grand Duke Henri as the country worked to raise awareness of the European wildcat (Felis silvestris silvestris), a species that had been functionally extinct in Luxembourg for over a century before limited natural recolonization from neighboring Belgium and Germany began in the early 2000s. The bimetallic format — nordic gold center pressed into a sterling silver ring — was a deliberate choice to elevate the piece above standard circulation, though the 5-euro face value kept it nominally spendable.

Luxembourg's wildcat population remains one of the smallest and most fragile in Western Europe, estimated in the low dozens.