Receipt of the Post Office of MENDOZA to that of Córdoba for mail and parcel posts received on 10/SE/1833, excellent quality! (Image)

Receipt of the Post Office of MENDOZA to that of Córdoba for mail received on 25/AP/1838, with inscription at top: "VIVA LA FEDERACIÓN!", excellent quality! (Image)

Receipt of the Post Office of SALTA to that of Córdoba for mail received on 30/MAR/1846, excellent quality! (Image)

Receipt of the Post Office of MENDOZA to that of Córdoba for mail received on 13/DE/1848, with inscription at top: "Viva la Confederación Argentina! - Mueran los Salvages Unitarios", excellent quality! (Image)

Folded cover without postage sent (by relay system) from Concepción to Yutí (I think it´s Tuyutí, in San Andrés de Giles) on 15/NO/1861, with inscription on back: "Las autoridades y vecinos le darán caballo a toda hora bajo su responsabilidad al que lo demore...", very fine quality, interesting! (Image)

Folded cover without postage sent by relay system (circa 1861 ) to "Teniente Coronel Don Francisco Lucero, DONDE SE HALLE" ("Lt Cnel Francisco Lucero, wherever he is"), with inscription on back: "Será auxiliado por las Postas y vecinos del trayecto, haciéndolos responsables a la más pequeña falta, hasta llegar a su titular", very fine quality, interesting! (Image)

Printed circular sent to the Justice of the Peace of Mercedes on 28/JUL/1862, with instructions to improve the postal service, because the relay system was being abused by the army authorities. With hand-written signature of Gervasio Posadas, VF! (Image)

Entire letter sent from San Carlos to Mendoza on 30/DE/1873, with a spectacular double circle mark "ESTAFETA DE SAN CARLOS- Mza" in indigo blue, very rare, excellent quality, with Alberto Solari certificate (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)

½c. Wrapper sent to Buenos Aires on 30/MAY/1889 with cancel of "ESTAF. AMBULANTE - F. C. Á LA PLATA Nº6", VF quality! (Image)

5c. Rivadavia stationery envelope (GJ.SOB-16) with its original letter datelined "CÁRCEL DE DETENIDOS, 1 DE OCTUBRE DE 1890". The cover was cancelled "Sl. ESTAC. LA PLATA" 2/OC, with several transit and arrival marks on back, excellent quality! (Image)

5c. Stationery envelope + 10c. additional postage, sent from FAMAILLÁ to Buenos Aires on 5/JUN/1891, rare cancel! (Image)

3 Covers used in Buenos Aires in 1892/3 franked with 2c, 3c and 5c. of the "3 Próceres" issues (the first 2 values are rare!), very fine quality! (Image)

12c. Stationery envelope (GJ.SOB-11) used in Buenos Aires on 10/OC/1892 by registered mail, VF quality, very scarce! (Image)

Cover with advertising corner card (Risso Patrón & Cia finishers and agents) used in Buenos Aires in MAY/1894, franked with 1c. Rivadavia, VF quality (Image)

Cover with advertising on front and back for factories of tobacco, cigars and cigarettes (horse, gaucho, Mauser rifles, etc), franked with 5c. of the "3 Proceres" issue, and sent from Buenos Aires to San Juan on 3/AU/1894, VF quality! (Image)

Certificate for "3 trips to this station in the month of January 1895", made by the stagecoach mail agency of Domingo Luque, hand-written on a Memorandum form of Ferro-Carril Central Córdoba, with signagure and blue handstamp of "F.C.C. CORDOBA - ESTACIÓN TRÁNSITO", VF quality, rare! (Image)

Certificate of "Mensajería Provincial de los Departamentos del Oeste" (Córdoba) stagecoach mail agency for "4 round trips in the month of March 1896" made by José S. Diaz, with signature and handstamp of HORNILLOS, VF quality! (Image)

Certificate of the trips made in the month of July 1896 by stagecoach mail agency of Mr Ángel Córdoba "according to its agreement with the government", signed and with handstamp of "EL SALTO" (Córdoba), VF quality, very rare! (Image)

Cover with advertising on back for "La Hispano Argentina insurance company", franked with pair of 1c. of the "3 Proceres" issue, sent from Buenos Aires to San Juan in 1897, VF quality! (Image)

Spectacular red cover with advertising printed head on front and reverse ("Factory of La Nacional vegetable oils, varnish and paints, and Dos Anclas linseed oil"), sent to San Juan on 5/FE/1898, excellent quality, rare, market value approx. US$100/125. (Image)

UNUSUAL DESTINATION and DOUBLE CROSSING of the Atlantic: 5c. Liberty head stationery envelope + additional postage of 43c., total 48c., sent by registered mail from Zárate to PERU on 6/MAR/1898, with Paris transit mark of 31/MAR (on front), on back transit of Buenos Aires and PAYTA arrival 4/MAY. The registration label is missing, very fine quality, very rare! (Image)

RAILWAY PO CANCELS: 5 Covers sent from towns in the provinces of Río Negro or Neuquén to Patagones (south of the province of B.Aires) franked with 5c. or 10c, all with interesting postal marks of different railway PO: "OFICINA POSTAL AMBULANTE Nª100, 128", "BRIGADA 35", "ESTAFETA FERROVIARIA 21-15", very fine quality, interesting group! (Image)

Certificate of the trips made in the month of August 1898 by stagecoach mail agency of Rafael Gutiérrez, WITH POSTAGE OF 5C., signed and with cancel of "LAS SALADAS" (Córdoba), VF quality, very rare! (Image)