Entire letter sent to Mercedes on 2/AU/1859, with rimless datestamp BUENOS AIRES (GJ.BUE 17A), excellent quality, catalog value US$50 (Image)

RARE CANCEL: Official folded cover sent to Mercedes without postage (circa 1876) with inscription: "Servicio urgente", along rare green-blue double circle handstamp "ESTACION FREIRE - F.C.O.", very fine quality, market value US$250 or more! (Image)

Official folded cover sent to Mercedes without postage on 23/SE/1876 inscribed "Servicio", along rectangular SUIPACHA datestamp and railway PO "E. AMB. F. C. O. B. A. - 6" mark of 24/SE perfecly applied, very fine quality, market value US$200 or more! (Image)

Cover (opened on 3 sides for display) sent WITHOUT POSTAGE on 18/FE/1884 from Ingenio Santa Lucía to Rosario. It was sent without postage due to the shortage of stamps, as indicated on back (handwritten note "There are no more stamps..."), with blue oval mark of "1º Distrito Comisaría Monteros - Tucumán"). It also bears a rectangular datestamp of MONTEROS (19/FE) on front and back, and arrival marks of Rosario 21/FE, fine quality, very interesting, market value US$100 (Image)

4c. Postal card with the additional postage missing, sent from Buenos Aires to Germany on 16/AP/1888, where the addressee could not be found (the card was forwarded to several cities) and eventually the piece was returned to sender (with label "Unbekannt - inconnu"), but by mistake it was sent first to Brazil where it also received another interesting label "INCONNU - desconhecido", very attractive, market value US$50 or more! (Image)

RARE OVAL CANCEL: Cover used in Buenos Aires on 4/MAR/1893 franked with 3c. (GJ.140) with oval cancel of an Oficina Sucursal, on back marks of "Buzonistas", "Abonados", etc., very fine quality, market value US$150 (Image)

3c. Lettercard uprated with 3c., sent from QUILMES to Germany on 5/JUN/1897, with transit marks of B.Aires, and Trier arrival, all on front, sent by "Librería y Juguetería Filatélica de Louis Cottet". Excellent quality, market value US$50 or more! (Image)

Certificate of Mensajería Provincial de los Departamentos del Oeste for "4 round trips" of a postal rider, with the rare rectangular datestamp of VILLA SAN CARLOS (Córdoba) for 1/JA/1899, VF quality, market value US$30 or more! (Image)

Certificate of Mensajería Provincial de los Departamentos del Oeste for "4 round trips" of a postal rider, with the rare double circle datestamp of VILLA DOLORES (Córdoba) in blue for 28/MAR/1899, VF quality, market value US$30 or more! (Image)

21/MAR/1929 Buenos Aires - Paraguay, first regular weeklet airmail by Aeroposta Argentina, with arrival backstamp of Asunción (22/MAR), very fine quality, market valu eUS$500 (Image)

Airmail cover sent from Buenos Aires to Germany on 22/DE/1951 with attractive postage of 5.70P., with Hamburg arrival backstamp of 28/DE, VF quality, market value US$75 or more! (Image)

LARGE POSTAGE: Express airmail cover sent from Buenos Aires to Germany on 27/AU/1959 with spectacular franking of 122.20P., with arrival backstamp of Berlin 31/AU (only 4 days later!), very attractive, market value US$100 (Image)