Cover sent from Paraná to Mr. GERVASIO POSADAS (General Postmaster) in Buenos Aires on 25/FE/1861, with pre-philatelic marks FRANCA in double ogive (GJ.PAR 6A) and CORREOS DEL PARANA rimless datestamp (GJ.PAR 7), both in blue, VF (Image)

4c. Postal card sent to Buenos Aires on 2/MAR/1882, with datestamp of ESQUINA (Corrientes), VF quality (Image)

4c. Postal card sent to Buenos Aires on 22/AP/1882, with datestamp of CONCORDIA, VF quality (Image)

4c. Postal card sent to Buenos Aires in FE/1885, with datestamp of CAÑADA DE GÓMEZ (Santa FE), VF quality (Image)

4c. Postal card sent to Buenos Aires on 7/JA/1886, with datestamp of NAVARRO (Buenos Aires), VF quality (Image)

4c. Postal card sent to Buenos Aires on 30/AU/1886, with rectangular datestamp of SANTA FE, VF quality (Image)

Lettercard franked with 5c., with view of Church of Itatí inside, sent from Corrientes to Buenos Aires on 1/JA/1902, VF quality (Image)

Postcard with view of Mitre park(Corrientes), editor García, franked with 5c. San Martín, sent from Corrientes to RUSSIA in AP/1928, VF (Image)

Postcard with view of Mitre park (Corrientes), editor Garcia, franked with 10c. and sent to RUSSIA (arrival 9/MAY/1928), VF (Image)

Postcard with view of Heinlein & Barolo buildings (Buenos Aires), franked with 5c. and sent to RUSSIA on 29/NO/1928, VF (Image)

Airmail cover sent from Buenos Aires to Germany on 2/OC/1931, franked with 12c. San Martín + 72c and 90c. First anniversary 1930 Revolution (total $1.74), VF (Image)

Registered airmail front sent from Buenos Aires to New York on 9/FE/1932, franked with $8.32 combining stamps of 4 different issues, fantastic (Image)

Registered cover franked with 10c and 15c. Visit of President of Brazil + 10c. San Martín (total 35c.), sent from Buenos Aires to Canada on 18/JUL/1934, VF (Image)

Registered airmail cover sent from Buenos Aires to Winterthur (Switzerland) on 7/MAR/1936 by Air France, franked with $1.35, arrival backstamp, VF (Image)

Cover sent to Porto Alegre (Brazil) on 6/AP/1937, franked with 5c., datestamp of ITACARUARE (Misiones), censored, VF quality (Image)

Airmail cover sent from San Isidro to Germany on 5/JUN/1937 by Air France, with transit mark of Paris, franked with $1.15, VF (Image)

Registered cover franked with 35c. and sent to Los Angeles (USA) on 7/JUN/1938, with USHUAIA datestamp, VF (Image)

Cover franked with 15c., sent to Pennsylvania (USA) on 3/AU/1939, with cancel of Pehuajó, VF (Image)

23/JUL/1943 Buenos Aires - London, airmail cover sent via New York, franked with $1.70, with British censor label, interesting red backstamp partially covered by the label, VF quality (Image)

Airmail cover franked with $1.45, sent by Condor from Buenos Aires to Frankfurt on 14/JA/1941, with Nazi censor label, VF (Image)

Airmail cover with meter postage, sent from Buenos Aires to Chicago on 8/JUL/1943, with censor label, VF (Image)

Cover sent to Buenos Aires on 24/SE/1954, with datestamp of CASILDA (Santa Fe), franked with 10c. Eva Perón and 10c. Rivadavia, with variety "white lock of hair", interesting combination! (Image)

Cover flown on the Buenos Aires - Switzerland first flight by Swiss Air on 11/AP/1957, VF quality (Image)

Cover used in 1959 from Villa Muñoz (Córdoba) to San Francisco (Córdoba), franked with pair of 10c. Rivadavia and pair of 40c. San Martín (total $1), combining stamps of Proceres & Riquezas I and II, VF (Image)

Express cover sent from María Grande (Entre Ríos) to San Francisco (Córdoba) on 13/JUL/1964, franked with 22P., with interesting auxiliary marks "MALA EXPRESO" and "SUELTA", VF (Image)