Internal airmail cover franked with 1935 5c orange brown (SG 653) tied by MONTE CASEROS CTES. cds dated 31 MAY 1945. Sent airmail to BUENOS AIRES with fine strike of three line 'POR AVION LINEAS AEREAS DEL ESTADO UTILICE SUS SERVICIOS' cachet in red on front and BUENOS AIRES arrival cds on reverse.