Commemorative issue25th Birthday of Guillaume, 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., A map, next to the face value, shows the European continent without borders., Finely ribbed with edge lettering: six times the sequence "2 * * " alternately upright and inverted