This striking stamp from Paraguay features a bold red "Correo Aéreo" overprint on a 10 centavos definitive, revalued to 5 centavos. Issued in 1929, it marks one of the early airmail issues of Paraguay, reflecting the growing importance of aviation in postal history. The olive-green background carries the national emblem surrounded by a wreath, with the surcharge making it suitable for airmail rates of the period. Such overprints are highly collectible, as they illustrate both economic and postal adjustments of their era. A desirable addition for collectors of South American and airmail philately.