Folded cover sent to Rosario on 1/AP/1868 franked with 5c. Rivadavia groundwork of horizontal lines (GJ.37), with very nice double circle "ADMON. DE CORREOS DE MENDOZA" cancel in green-blue, VF quality! (Image)

Front of cover franked with pair GJ.49, sent from RIO CUARTO to Córdoba on 17/OC/1877, VF quality! (Image)

Entire letter franked by GJ.49, sent from ROSARIO to Córdoba on 20/MAY/1878, excellent quality! (Image)

Folded cover (with minor defect below) franked by GJ.49 and sent from TUCUMÁN to Córdoba on 1/JUN/1878, very nice! (Image)

8c. Cover (PS) sent from PARANÁ to "Fonda Francesa"(PARAGUAY) on 13/JA/1887, and returned to sender "because the addressee passed away", Buenos Aires and Asunción transit marks, VF, extremely rare destination! (Image)

Cover franked with 24c. (GJ.54B x3) sent from ROSARIO to Germany on 7/JUN/1890, very nice! (Image)

GJ.133 + 134, fraking ALONE wrappers for printed matter used in August and September 1890. These stamps are very scarce used alone on cover, paying the basic rate for newspapers, rare! (Image)

Small unsealed cover used in San Juan on 2/JA/1901, franked with pair 1c. Liberty (GJ.218, one with defects), very nice, scarce rate! (Image)

Front of cover of a heavy printed matter (it possibly contained a book), sent from Buenos Aires to San Juan in February 1901, franked with 40c. (pair GJ.229), VF quality, rare rate! (Image)

Registered cover sent from BELLE VILLE to Buenos Aires on 1/AU/1901, franked with 35c. (Liberty seated 5c. x2 + 10c. + 15c.), VF quality! (Image)

RARE CANCEL: Registered cover sent from SAAVEDRA (F.C.S.) to Buenos Aires on 8/NO/1902, franked with 30c. (Seated Liberty 24c + 5c + 1c.), excellent quality! (Image)

Cloth envelope sent as PARCEL POST of 180 grams from Buenos Aires to San Juan in DEC/1913, franked with Plowman 2c. + 12c. block of 4 (total postage 50c.), excellent and very rare! (Image)

Registered cover sent from Buenos Aires to San Juan on 10/OC/1914, franked with 37c. (Plowman 5c. x5 + 12c.), excellent! (Image)

Registered cover sent from SANTA TERESA (Santa Fe) to San Juan on 26/NO/1915, franked with 17c.: Plowman 12c. Italian paper (GJ.369) + 5c. unwatermarked French paper (GJ.394), VF, rare postmark! (Image)

Registered cover sent from Buenos Aires to San Juan on 15/DE/1915 franked with 37c. (Plowman 5c. + 12c. + 20c.), it received 3 official seals at top "Received in bad condition", excellent and rare! (Image)

Registered cover sent from LAS FLORES (San Juan) to San Juan on 20/DE/1916, franked with 17c. (GJ.398 + 403 x3), excellent quality, very rare! (Image)

RARE BISECT: Cover used in Buenos Aires on 15/OC/1917 (error in the postmark, month inverted), franked by GJ.408 pair + VERTICAL BISECT + GJ.411 (strip of 5), very nice! (Image)

5c. Cover (postal stationery) cancelled SAFORCADA (Buenos Aires) 26/OC/1922, rare! (Image)

5c. Cover (PS) sent to Buenos Aires on 3/NO/1922, with the very rare double circle datestamp of ATALAYA (Buenos Aires), VF! (Image)

12c. Airmail stationery envelope + high additional postage (total 6P.), sent from Buenos Aires to France on 4/OC/1929, VF quality, rare! (Image)

Cover sent stampless from BOLIVAR to Buenos Aires on 13/SE/1930, with postage due mark for 10c, handsome! (Image)

Newsletter of the Ferrari stamp store in Buenos Aires (BOLETÍN FERRARI) posted locally in NOV/1930 franked with ½c. Revolution of 1930 (GJ.670) ALONE, fine quality, very rare! (Image)

Registered cover franked with 45c. (stamps of the San Martín w/o period issue), sent from HAM to Buenos Aires on 1/AP/1931, VF! (Image)

Registered airmail cover franked with 3.59P. (6 different stamps!), sent from Buenos Aires to Germany on 11/MAR/1932, VF quality! (Image)

RARE DESTINATION FOR A POSTAGE DUE PIECE: Cover franked with 10c. San Martín w/o period (GJ.600) sent from Ramón Santa Marina to ESTONIA on 14/DE/1933, with postage dues for 20c. for insufficient postage, with hexagonal postage due mark applied at destination, and arrival backstamp, VF quality! (Image)