This Luxembourg definitive stamp features the portrait of Grand Duchess Charlotte, framed by an ornate border and topped with a crown. Originally issued in black with a 25c denomination, this example bears a German occupation overprint of “3 Rpf” (Reichspfennig), applied during World War II. Such overprints were made when Luxembourg was annexed and its postal system integrated under German administration. These issues are notable for their dual historical significance—linking Luxembourg’s sovereignty with the wartime postal history of Nazi occupation. Collectors value them for their rarity, variations in surcharge types, and condition.