O) 1937 COSTA RICA, MAP OF COCOS ISLAND AND SHIPS OF COLUMBUS, KANTON APENZELL, XF
O) 1942 COSTA RICA, OFFICIAL MAIL, DURAN SANATORIUM, HEALTH DAY, DIA PANAMERICANO DE LA SALUD - OVERPRINTED, NEW NATIONAL UNIVERSITY - FOUNDED, BANCO NACIONAL DE COSTA RICA, CIRCULATED COVER TO USA
O) 1945 COSTA RICA, LOCOMOTIVE, CORREO AEREO 1945 OVERPRINTED IN RED, CONTINENTAL DEFENSE CENSORSHIP, LIBRERIA IMPRENTA Y LITOGRAFIA, AIRMAIL TO ARGENTINA