This 0.45 franc French postage stamp, issued in 1969, features the striking medieval architecture of Châlons-sur-Marne (now Châlons-en-Champagne). The engraved image depicts the charming Porte Sainte-Croix or a similar water gate, showcasing Renaissance influences with its conical tower and ornate stonework. Designed by Pierre Gandon and engraved by Claude Durrens, the stamp reflects France's tradition of architectural heritage on postage. The deep green and brown tones add depth and elegance to the historical subject. A fine example of regional architectural celebration in mid-20th-century French philately.