25th birthday of Grand-Duke Guillaume, heir to the throne
The effigy of Grand-Duke Henri is superimposed on that of Grand-Duke Guillaume in the centre of the coin. The year of issue, 2006, appears below the effigies, flanked by the letter ‘S’ and the mintmark. The word ‘LËTZEBUERG’ appears above the effigies. The 12 stars of the European Union are shown in the outer ring of the coin.