This striking airmail issue from Paraguay features the Jesuit Mission ruins at Santa María, engraved in deep green with excellent architectural detail. Overprinted in vivid red is Paraguay’s national emblem, along with the bold “36” surcharge, creating a dramatic bi-color visual effect prized by specialists. The stamp commemorates the Silver Jubilee of Mons. Rodríguez and carries additional inscriptions referencing the UPU. Printed by the esteemed Inst. de Grav. Paris, it represents a beautiful example of mid-century Paraguayan engraved airmail production.