Issued in 1966, this elegant 6-franc brown stamp from Luxembourg commemorates the Tricentenaire de Notre-Dame de Luxembourg (1666–1966). The design beautifully depicts a detailed section of the cathedral’s ornate Gothic architecture—specifically a sculpted arch adorned with angels and decorative motifs. Designed by S. L. Hartz and printed by Enschedé, the issue celebrates three centuries of the nation’s most iconic religious and cultural monument, which holds deep spiritual importance as the shrine of the “Consoler of the Afflicted,” Luxembourg’s patron saint.