This classic Paraguayan airmail stamp, valued at 20 centavos, was issued in the 1930s. Printed in a rich brown-orange shade, it features an early monoplane flying above bold lettering that promotes Paraguay’s famed yerba mate: “La Yerba Paraguaya es la mejor” (“Paraguayan yerba is the best”). The design is framed by stylized foliage, symbolizing the plant central to the country’s culture and economy. Issued under the “Correo Aéreo” series, it also bears the UPU emblem, reflecting Paraguay’s integration into international mail networks. A highly collectible piece that combines aviation history with national heritage promotion.