This classic postage due stamp from Luxembourg features the Grand Ducal coat of arms beneath a royal crown, symbolizing the authority of the Grand Duchy’s postal administration. Issued in the late 19th century, it was used to collect insufficient postage from recipients rather than prepay mail. The elegant ornamental frame and bold “G.D. de Luxembourg” inscription reflect traditional European fiscal-postal design of the era. The orange coloration distinguishes the higher due value within the series. Early Luxembourg postage dues are highly collectible for their historical postal usage and classical typography.