Circa 1790: Front of folded cover to Santiago de Chile, with framed "MENDOSA" mark in red, very well applied, excellent quality! (Image)

Circa 1800: Front of folded cover to Santiago de Chile, with red 2-line BUENOS AYRES mark perfectly applied, excellent quality! (Image)

Entire letter franked by GJ.49, sent to Salta on 20/OC/1878, datestamp of JUJUY with Maltese cross, minor defect, excellent appeal! (Image)

Cover franked by GJ.79A (12c. Little envelope, green-blue) sent from Buenos Aires to USA on 10/JA/1888, with interesting "DESPUES DE HORA" mark, VF! (Image)

1c. Wrapper (PS) sent from JUAREZ (B.Aires) to Paysandú (Uruguay) on 13/MAR/1890, taxed due to insufficient postage, VF quality! (Image)

5c. Stationery envelope sent from CAFAYATE (Salta) to Tucumán on 10/JA/1895, VF and rare cancel! (Image)

Cover sent to Tucumán on 26/MAR/1895, franked by GJ.141, with the very rare double circle datestamp of DELFÍN GALLO (Tucumán). With defects, but very well applied and interesting! (Image)

Cover with advertising on front and back for "El Pensamiento tea", franked with 2c. of the "3 Proceres" issue, and sent from Buenos Aires to San Juan in 1895, VF quality! (Image)

Registered cover with AR sent from Rosario to San Juan on 23/DE/1897 franked with 32c. (GJ.176 + 178 x6), with some minor opening defects that do not affect the stamps, very nice! (Image)

Commercial cover of "La Tudelana store", franked with 5c. of the "3 Proceres" issue, sent from JACHAL to San Juan in SEP/1899, VF quality! (Image)

Front of cover sent from Buenos Aires to San Juan on 22/DE/1899, franked with 5c. (pair and strip of 3 of 1c. "3 Proceres" issue), VF quality! (Image)

Registered cover franked with strip of 4 of 10c. Seated Liberty, sent from Buenos Aires to San Juan on 23/OC/1900, excellent quality! (Image)

6c. Postal card sent to Netherlands on 16/JA/1902, with the extremely rare blue oval cancel of "F.C.B.A. Y ROSARIO - LAS PALMAS", transit mark of Buenos Aires for the same day, and Netherlands arrival mark, all applied on front. The mark of Las Palmas is extraordinarily rare! (Image)

4c. Liberty postal sent from NUEVA BAVIERA F.C.N.O.A. to Tucumán on 22/MAR/1902, VF quality, rare cancel! (Image)

Wrapper for a religious journal, franked with ½c. Seated Liberty ALONE, sent from Buenos Aires to San Juan, excellent quality, very rare! (Image)

Advertising card for "Moneyweight balances", franked with 2c. Seated Liberty and sent from Buenos Aires to SANTA LUCÍA (San Juan) on 20/AP/1904, with good arrival cancel, excellent quality, rare! (Image)

12c. Stationery envelope + GJ.222 x4 (total postage 32c.) sent from GENERAL VILLEGAS to Germany in OC/1905, rare postmark, VF! (Image)

RARE INTERNATIONAL RATE: Cover (unsealed, it contained printed matter or commercial papers) sent from Buenos Aires to Germany on 8/DE/1908 franked with 3c. (GJ.220 ALONE), VF quality, very scarce! (Image)

Postcard (view of pier for gondolas, 3 de Febrero park, Buenos Aires) franked with 3c. San Martín in oval (GJ.278), sent to Germany on 15/AP/1911 and forwarded to Paris, VF quality! (Image)

Cover sent to Buenos Aires on 18/FE/1913, with the rare cancel SAN PEDRO DE COLALAO (Tucumán) in blue, VF! (Image)

Front of cover sent from Buenos Aires to San Juan on 24/JUN/1935, franked with 1c. (pair ½c. San Martín without period), reduced rate for "Impreso diferido", VF quality, scarce! (Image)

Front of cover sent from Buenos Aires to San Juan franked with 2c. (pair GJ.737), reduced rate for "Impreso diferido", VF quality, rare! (Image)

Cover sent to Buenos Aires on 15/JUN/1940, franked with 5c. Moreno, cancelled ESTACIÓN VÍVORAS (Buenos Aires), VF and rare! (Image)

Express cover sent to Buenos Aires on 3/MAR/1941, franked with 35c. and postmarked NAPALEOFÚ, excellent quality, very rare! (Image)

Airmail cover sent from Buenos Aires to Switzerland on 29/JA/1943 franked with 1.45P., and British - German DOUBLE censor label, VF quality! (Image)