Designer: Julien et Nina Lefèvre; mark: J.N. Lefèvre
Reference: KM# 55
Diameter: 21 mm
Reverse In the central part, the inscription '1 F' (1 Franc), with laurel branches tied at the bottom with a ribbon in saltire on the left and right, and the Grand Ducal crown above. Along the lower edge arc, the year of minting '1973'.
Obverse In the center, the left-facing profile of Jean, Grand Duke of Luxembourg (Jean Benoît Guillaume Robert Antoine Louis Marie Adolphe Marc d'Aviano). Along the rim, inscriptions in French: on the left 'JEAN GRAND-DUC' (Jean Grand Duke), on the right 'DE LUXEMBOURG' (of Luxembourg), at the bottom the designer's initials Julien et Nina Lefèvre - J.N.Lefèvre.