O) 1904 CHILE, GUAYAQUIL, SEMINARY PARK, CIRCULATED TO MONTEVIDEO
O) 1910 COSTA RICA, JOSE JIMENEZ, SCT 76 1 col. brown, USED
O) 1911 COSTA RICA, JUAN MORA FERNANDEZ, SCT 60 2c yellow green, OVERPRINTED 1911, MNH, XF
O) 1915 COSTA RICA, TELEGRAPH STAMPS SURCHARGE IN ROSE, JUAN MORA FERNADEZ 10c, ALMACEN Y TIENDA LA COMPETENCIA, AIRMAIL CIRCULATED TO USA
O) 1916 COSTA RICA, SAN JOSE, GERARDO MONTAGNE C. BRAULIO CARILLO 10c blue. CIRCULATED COVER TO USA
O) 1918 COSTA RICA, CENSORSHIP, BRAULIO CARRILLO, MAURO FERNANDEZ, FROM SAN JOSE, CIRCULATED TO NEW YORK
O) 1919 COSTA RICA, MAURO FERNANDEZ 5 centimos orange, CIRCULATED TO MONTGOMERY
O) 1923 circa, COSTA RICA, AMERICAN BANK NOTE, GENERAL POST OFFICE, 5c green, CIRCULATED COVER FROM SAN JOSE DE COSTA RICA
O) 1923 COSTA RICA, AMERICAN BANK NOTE STAMPS, BANANA GROWING, GENERAL POST OFFICE, NATIONAL MONUMENT, RODRIGO ARIAS MALDONADO, PORT, LANDSCAPE, POSTAL CARD XF
O) 1923 COSTA RICA, REVENUE, BERNARDO AUGUSTO THIEL, GERMAN PRIEST, EVANGELIZATION OF INDIGENOUS PEOPLE, BENEMERITO 1901, XF
O) 1924 CIRCA. COSTA RICA, MAP OF GUANACASTE SCT 131, 5c green, ANNEXATION OF PROVIDENCE TO COSTA RICA, XF
O) 1935 COSTA RICA, ALLEGORY OF FLIGHT - USE GOVERNMMENT OFFICIALS, MAIL PLANE ABOUT TO LAND, CIRCULATED TO PARIS
O) 1937 COSTA RICA, MAP OF COCOS ISLAND AND SHIPS OF COLUMBUS, KANTON APENZELL, XF
O) 1938 COSTA RICA, COFFEE HARVESTING, THE HEART OF THE AMERICAS SLOGAN, CIRCULATED TO USA
O) 1939 COSTA RICA, TELEGRAPH STAMP SURCHARGED FOR POSTAGE AS IN 1929, CIRCULATED COVER FROM SAN JOSE TO USA
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) 1943 - 1946 COSTA RICA, DIE PROOF, JUAN MORA FERNANDEZ, BRUNO CARRANZA, TOMAS GUARDIA, ANICETO ESQUIVEL,
O) 1944 COSTA RICA, FRANCISCO MORAZAN OREAMUNO, VIA AEREA, BOX CANCELLATION, CENSORSHIP, LIBRERIA IMPRENTA Y LITOGRAIFA, CIRCULATED TO ARGENTIN
O) 1945 COSTA RICA, DIE PROOF, COFFEE HARVESTING, BUOYING, OXES, XF
O) 1945 COSTA RICA, LOCOMOTIVE, CORREO AEREO 1945 OVERPRINTED IN RED, CONTINENTAL DEFENSE CENSORSHIP, LIBRERIA IMPRENTA Y LITOGRAFIA, AIRMAIL TO ARGENTINA
O) 1945 COSTA RICA, QUEPOS VIA PANAMA, JUAN RAFAEL MORA, SURCHARGE, NEW NATIONAL UNIVERSITY, FOUNDED IN 1940, CENSORSHIP, CIRCULATED TO USA
O) 1946 COSTA RICA, AMERICAN EMBASSY IN SAN JOSE, AIRMAIL. DIPLOMATIC MAIL, OFFICIAL, SAN JUAN DE DIOS HOSPITAL, CIRCULATED TO USA
O) 1948 COSTA RICA, CENSORSHIP, DEFENSA CONTINENTAL, FROM ALAJUELA, PRESIDENT. MANUEL AGUILAR. PORTRAIT, FEDERAL PRESIDENT FRANCISCO MORAZAN, TORCH OF FREEDOM VICTORY AND FLAGS OF AMERICAN NATIONS, CIRCULATED TO USA
O) 1950 COSTA RICA, DIPLOMATIC MAIL SERVICE, EMBASSY OF MEXICO IN COSTA RICA, MANUEL AGUILAR 40c, PRESIDENT, FRANQUICIA POSTAL PANAMERICANA, AIRMAIL, CIRCULATED TO USA
O) 1952 COSTA RICA. MAIL PLANE ABOUT TO LAND, FRANCISCO M. OREAMUNO, AIRMAIL CIRCULATED TO SPAIN.
O) 1953 COSTA RICA, QUEEN ISABELLA I AND CARAVELS OF COLUMBUS, DR CARLOS LUIS VALVERDE - WAR FOR NATIONAL LIBERATION, CIRCULATED TO GERMANY, H. VON HEYMANN, XF
O) 1953 COSTA RICA, QUEEN ISABELLA I, CARAVELS OF COLUMBUS, LIBERIA ESTUDIO AIRMAIL. TO SPAIN
O) 1954 COSTA RICA, AMERICAN BANK NOTE, MAIL PLANE ABOUT TO LAND, BRUNO CARRANZA, MULTIPLE STAMPS, CIRCULATED TO GERMANY
O) 1955 COSTA RICA, REFINERY OF VEGETABLE OILS AND FATS, PRESIDENT VICENTE HERRERA, SUGAR INDUSTRY, REPRESENTACIONES VALITUTTI AND CO, AIRMAIL TO SWITZERLAND
O) 1956 COSTA RICA, INDUSTRY . SUGAR, THE COSTA RICA MERCANTIL, AIRMAIL TO SWITZERLAND, XF