Watch List notes:

Luxembourg, Grand Duchy, Regent Adolphe of Nassau (1890-1905), Pattern 5-Centimes, 1889, unadopted type, crowned shield, rev. value in wreath, ESSAI below (KM E13), full mint colour, as struck, rare with a reported mintage of only 100 pieces, in PCGS holder, graded SP64RD.
PCGS Certification #36122604