This classic Paraguayan stamp features an olive-green design with the UPU emblem and denomination of 10 centavos. It has been boldly overprinted in red with the words “CORREO AÉREO”, marking its use for early airmail service. Issued in the 1920s, such provisional overprints were created to meet the growing demand for air postal communication in South America. A fine collectible for those focusing on airmail history, Latin American philately, or overprint varieties. A stamp that embodies the evolution of international postal systems.