Registered cover franked with 1926 20c yellow brown with 'OFICIAL' overprint and 1929 25c orange with 'Correo Aereo' and 'OFICIAL' overprints (SG O522 & O618) tied by MANAGUA cds's with boxed registration marking alongside and straight line 'OFICIAL' all in purple. Addressed to UK with various transit & arrival marks on reverse. Scarce issue on cover.