This striking Luxembourg stamp, issued in 1914, features the portrait of Grand Duchess Marie-Adélaïde, the nation’s first reigning duchess of the 20th century. Rendered in a vivid red shade, the 15 centimes denomination showcases fine engraved detail within an ornate frame topped with a crown. The issue belongs to the “Grand Duchess Marie-Adélaïde” definitive series, marking an important era in Luxembourg’s royal and postal history. Highly collectible, it represents both monarchy and national identity at a pivotal pre–World War I moment. A must-have piece for Luxembourg specialists and classic European collectors.